CIRCUIT
PROTECTION
SOLUTIONS
Electronics Circuit Protection
Product Selection Guide
A guide to selecting Littelfuse circuit protection
components for electronic applications.
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Portfolio of Product
Backed by Unparalleled
Circuit Protection
Expertise
Reader Experience Topic Page
Intermediate
Common Circuit Threats and Protection Solutions 2-3
Circuit Protection Technologies Comparison 4-5
Application Solutions Lists 6-9
Experienced
Product Selection Guides:
Overcurrent Protection Technologies
• Fuses, Fuseholders, PTCs
Overvoltage Suppression Technologies
• Varistors (MOVs, MLVs)
• Gas Discharge Tubes (GDTs)
• Electrostatic Discharge (ESD) Suppressors
• PLED LED Protectors
• SPA™ Silicon Protection Arrays
• TVS Diodes
• SIDACtor® Protection Thyristors
Switching Technologies
• Switching Thyristors
10-13
14-21
22-23
ABOUT THIS GUIDE
This guide provides a summary of key circuit protection consideration factors, descriptions
of the technologies Littelfuse offers, and product selection tables. It is designed to help you
quickly nd a protection solution appropriate to your application.
1
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WHY CHOOSE CIRCUIT PROTECTION
Circuit protection devices interrupt overcurrent events and divert
overvoltage surges. They increase safety and enable end products to
survive harsh conditions.
Most electrical and electronic equipment require circuit protection
devices. In many cases they must be installed to comply with safety
standards before the end products can be sold or used.
Beyond this, strategically-selected protection devices will:
• Improve end-product uptime, sustainability and reliability
• Assure low warranty return, repair and replacement costs
• Minimize re and shock risks and larger damage potential
• Minimize operating dangers and potential liabilities
WHY CHOOSE LITTELFUSE
Littelfuse is the global leader in circuit protection solutions.
We are the only company to offer all of the pertinent circuit protection
technologies, with products that can be used in virtually everything
that uses electrical energy.
Complementing our wide portfolio of circuit protection products is a
global network of design and technical support expertise.
We offer decades of design experience to help you address
application challenges and achieve regulatory compliance.
Your Single Source
Littelfuse offers an extensive circuit protection product line.
We design forward-thinking, application-specic solutions to provide
assurance that your most demanding requirements will be met.
Our goal is to provide the most complete range of options so that you
will not have to make compromises.
Testing Support
Littelfuse can help assure that your products will withstand most
common threats repeatedly and will fail safely under extreme
circumstances. We can serve as an independent source to assist
as you design.
Application Knowledge
For over 80 years, Littelfuse has maintained a focus on circuit protection,
and we will continue to adapt as technologies evolve. Engineers and
circuit designers around the world have come to rely on Littelfuse
products and application knowledge to support their designs.
Global Support
Littelfuse products, application knowledge and technical support are
available around the globe. We offer a network of regional customer
support ofces and hundreds of independent authorized distributor
contacts to assist you. Visit www.littelfuse.com/contact to nd local
support near you.
Standards Compliance Expertise
Most Littelfuse products comply to a wide range of applicable industry
and government guidelines, as well as our own rigorous quality and
reliability criteria. We continually look forward and adapt to changing
requirements, so that our products will comply with industry specic,
national and international standards such as Telcordia, UL, ISA, ANSI,
ISO, ICC, IEC, ITU, METI, CSA, DVE, RoHS, TIA and many others.
FOR FURTHER GUIDANCE
Littelfuse product representatives will work with you to nd circuit
protection technologies that will meet your requirements.
Please contact a representative near you (www.littelfuse.com/contact) to
address your requirements or questions in detail.
For reference diagrams, technical articles, and other application guidance
materials to assist in your design processes, please visit
www.littelfuse.com/designsupport
For detailed selection of Littelfuse circuit protection technologies and
their common applications, please visit www.littelfuse.com/products
For a library of detailed application guides, please visit
www.littelfuse.com/application-design-center
To nd particular product series that may serve your requirements,
please go to www.littelfuse.com/series/(Series Name).html
To download the most current edition of this brochure and our product
catalogs, please visit www.littelfuse.com/catalogs
2
Threat or
Circuit Action
What is the threat or circuit
action that may damage
sensitive electronics?
Typical
Applications
What are the typical
end products that require
protection from this damage?
Principal
Protection Criteria
What are the characteristics
required of the
circuit protection technology?
Littelfuse Protection
Technologies
Which circuit protection
technologies best serve
these types of situations?
Overcurrent / Ground Faults Systems that are grounded and/or
in near proximity to AC power lines
Proper interrupting rating, current
carrying capability and voltage rating Fuses and/or PTCs
Lightning
Any electronic or electrical equipment
with connections to the
outside environment
Fast response,
proper switching threshold,
surge current rating
SIDACtor® Protection Thyristors,
Varistors (MOVs),
TVS Diodes,
Gas Discharge Tubes (GDTs)
Electrostatic Discharge (ESD) Any electronic equipment
with a human interface
Fast response,
high peak voltage rating
PulseGuard® ESD Suppressors,
SPA™ Silicon Protection Arrays,
Multi-Layer Varistors (MLVs)
PLED LED Protectors
Electrical Fast Transients (EFT) Any system that has inductive loads Fast rise time and recovery
for repetitive pulses
TVS Diodes,
Varistors (MLVs and MOVs)
PLED LED Protectors
Inductive Load Switching and
Commutative Spikes
Large motors, pumps, compressors,
relays and AC distribution High energy rating Varistors (MOVs and MLVs),
GDTs, TVS Diodes
Data and Communication Line
Voltage Transients
Ethernet, xDSL, data bus,
telecom, etc.
Fast response,
low load capacitance
SPA™ Silicon Protection Arrays,
SIDACtor® Protection Thyristors
Current Switching / Diversion Wide range of electrical and
electronic circuits
Proper blocking voltage and current
carrying capacity
Switching Thyristors
PLED LED Protectors
Common
Circuit Threats
and Protection
Solutions
3
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OVERCURRENT EVENTS
Excessive current events can lead to catastrophic
failures in electronic circuits. These failures can
result in safety hazards such as re, shock, or
explosion. Common types of overcurrent
threats include:
Overload
Overloads occur when more current is allowed to
flow through a circuit path than it was designed
to carry. This excess current can generate and
accumulate heat and result in complete circuit
destruction and possible re, electrocution or
explosion. Sources of overload can include:
• Construction hazards cutting across power mains
• Equipment failure in the power grid
• Environmental hazards on the power grid
• Short spikes of energy within the circuit as a result
of turning equipment on or off
Short Circuit
Short circuits occur when one conducting path
comes in contact with another conducting path or
with ground, such as may occur due to a loose wire,
insulation breakdown, or contact with water. These
conditions can increase the likelihood of arcs, shock,
or re hazards.
The principal forms of protection against overcurrent
conditions include fuses and resettable positive
temperature coefcient (PTC) thermistors.
Their function is to limit current to acceptable
levels and prevent catastrophic events, and during
acceptable conditions act dormant with a minimal
amount of resistance to the circuit.
Fuses will completely stop the ow of current when
opened, which may be desired with sensitive,
expensive or critical applications.
PTCs offer the ability to re-set for withstanding
most minor, common and recurring overcurrent
events. They will allow safe levels of current to pass
continuously, and during major overcurrent events,
increase in resistance as they heat, to restrict the
ow of current. When the overcurrent event ends,
the device resets to its normal operating state.
VOLTAGE TRANSIENT EVENTS
Voltage transients are short duration surges or
spikes. Unsuppressed, they may damage circuits and
components, and result in complete system failure.
Below are descriptions of common types of voltage
transients, and technologies to reduce their effects:
Electrostatic Discharge (ESD)
Damage from ESD is generally caused by the transfer
of static electrical charge from a body to an electronic
circuit. It may result in faulty circuit operation, latent
defects, and even catastrophic failure of sensitive
components. ESD suppressors must have very fast
response times and handle high peak voltages and
currents for short durations. Littelfuse offers a range
of PulseGuard® ESD suppressors, Multi-Layer Varistors
(MLVs) and SPA™ Silicon Protection Array products
designed to suppress these types of events
(see page 16).
Inductive Load Switching
Switching of inductive loads, such as those that occur
with transformers, generators, motors, and relays, can
create transients up to hundreds of volts and amps,
and can last as long as 400 milliseconds, affecting both
AC and DC circuits. For these applications, commonly
used suppressor devices include Metal Oxide Varistors
(MOVs), Gas Discharge Tubes (GDTs), and Transient
Voltage Suppression (TVS) Diodes.
Lightning Induced Transient
Most transients induced by nearby lightning strikes
result in an electromagnetic disturbance on electrical and
communication lines connected to electronic equipment.
Devices that protect against these transients must have a
fast response time and must be able to dissipate a large
amount of energy. Littelfuse Metal Oxide Varistor (MOV),
TVS Diode and GDT products are typically used to protect
against these events. Look to Littelfuse SIDACtor® and
SPA™ products for Telecom/Datacom requirements
(see page 8).
Automotive Load Dump
Load dump refers to what happens to the supply voltage
in a vehicle when a load is removed. If a load is removed
rapidly (such as when the battery is disconnected while
the engine is running), the voltage may spike before
stabilizing and damage electronic components. In a
typical 12V circuit, load dump can rise as high as 120V
and take 400 ms to decay—more than enough to cause
serious damage. Littelfuse offers a wide range of TVS
Diode and Multi-Layer Varistor (MLV) products designed
to protect against these types of events.
Common Circuit Threats
4
Littelfuse
Circuit Protection
Technologies
Technology
Key Features
and Protection
Characteristics
When / Where
Typically Used
Surge Energy
Rating Range
Typical
Voltage
Clamping
Speeds
Typical
Capacitance/
Insertion Loss
Mounting/
Size/
Packaging
Options
Overcurrent Protection Technologies:
Fuses
Completely stop current flow,
which helps to identify faults;
Wide range of options
Ultimate protection for sensitive/
expensive/critical components Low thru Very High Not applicable Series impedance
measured in nH
Very Extensive Range
of Options
PTCs
Resettable; No device
replacement after most
common overcurrent events
Where overcurrent events may
occur often, and continuous uptime
desired
Low thru High Not applicable Series resistance
measured in ohms
Surface Mount, Radial
Leaded, Axial Strap
Overvoltage Suppression Technologies:
GDTs
Switches that turn to on state and
shunt overvoltage to ground using a
contained inert gas as an insulator
Protection of
telecom equipment
from lightning surges
Medium thru High Fast Low
Surface Mount, Axial
Leaded,
2/3 Lead Radial
Multi-Layer
Varistors (MLVs)
Compact and capable of handling
significant surges for their size
ESD and EFT suppression in
smaller and portable electronics Low thru Medium Moderate High Miniature
Surface Mount
Metal-Oxide
Varistor (MOVs)
Capable of withstanding very
high energy transients;
Wide range of options
Appliance, industrial and very high
energy suppression applications
Medium thru
Very High Moderate High Radial Leaded,
Industrial Terminal
PLED LED
Protectors
Shunt function bypasses open
LEDs; ESD and reverse power
protection
High brightness outdoor
LED lighting applications Low Very Fast Medium Miniature
Surface Mount
PulseGuard®
ESD Suppressors
Extremely low capacitance;
Fast response time;
Compact size
ESD suppression;
Ultra fast reaction;
Low signal distortion
Low Moderate Low Miniature
Surface Mount
SPA™ Silicon
Protection Arrays
Low capacitance /
low clamping voltage;
Compact size
ESD suppression; Low distortion;
Ideal for I/O interfaces and digital &
analog signal lines
Low thru Medium Very Fast Low Extensive range of
surface mount options
TVS Diodes
Fast response to
fast transients;
Wide range of options
Semiconductor protection;
telecom I/O interfaces, electronics,
industrial equipment
Medium thru High Fast High Axial Leaded, Radial
Leaded
SIDACtor®
Protection
Thyristors
Specifically designed to
serve stringent telecom/
networking standards
Telecom and networking
applications Medium thru High Very Fast Low
Extensive range of
surface mount and
thru-hole options
Switching Technologies:
Power Thyristors
Solid state switches that switch
to low “on” state and control the
flow of current
Home appliances, power tools,
outdoor equipment Not applicable Not applicable Not applicable
Extensive range of
surface mount and
thru-hole options
5
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1
3
5
7
OVERVOLTAGE SUPPRESSION
TECHNOLOGIES (1-6)
2
1. TVS Diodes — Suppress
overvoltage transients such as
Electrical Fast Transients (EFT),
inductive load switching and
lightning in a wide variety of
applications in the computer,
industrial, telecom and
automotive markets (Page 19).
2. Varistors — Multiple forms,
from Metal Oxide Varistors
(MOVs) that suppress transient
voltages to Multi-Layer Varistors
(MLVs) designed for applications
requiring protection from
various transients in computers
and handheld devices as well
as industrial and automotive
applications (Page 14).
3. SIDACtor® Devices —
Complete line of protection
thyristor products specifically
designed to suppress
overvoltage transients in a
broad range of telecom and
datacom applications
(Pages 20-21).
4. Gas Discharge Tubes
(GDTs) — Available in small
footprint leaded and surface
mount configurations, Littelfuse
GDTs respond fast to transient
overvoltage events, reducing
the risk of equipment damage
(Page 15)
.
5. Silicon Protection Arrays
(SPA™) — Designed specifically
to protect analog and digital
signal lines from electrostatic
discharge (ESD) and other
overvoltage transients
(Pages 16, 18).
6. PulseGuard® ESD
Suppressors — Available in
various surface mount form
factors to protect high-speed
digital lines without causing
signal distortion (Page 16).
7. Positive Temperature
Coefficient Devices (PTCs) —
Provide resettable overcurrent
protection for a wide range of
applications (Page 13).
8. Fuses and Holders —
Full range including surface
mount, axial, glass or ceramic,
thin-film or Nano2® style, fast-
acting or Slo-Blo®, as well as
a wide selection of fuseholder
devices (Pages 10-12).
9. Switching Thyristors —
Solid-state switches used to
control the flow of electrical
current in applications, capable
of withstanding rated blocking/
off-state voltage until triggered
to the on-state (Pages 22-23).
10. PLED LED Protectors —
Specialty silicon devices that
enable LED lighting strings
to continue to function if any
single LED fails as an open
circuit, and also offer ESD and
reverse power protection
(Page 17).
OVERCURRENT
PROTECTION
TECHNOLOGIES (7-8)
4
8
6
SWITCHING
TECHNOLOGIES
9
Technologies Comparison
10
SPECIAL APPLICATION
PRODUCTS
6
Application
Solutions by
Circuit Type and
Related Threat
Circuit Type Function or Threat Standards Littelfuse Product Series
Medium/Low-Speed
Data Interfaces:
USB 1.1, Ethernet, RS-232,
RS-485, Keypads, Audio,
Analog Video
ESD, EMI, EFT
IEC61000-4-2
IEC61000-4-4
IEC61000-4-5
SPA™
Devices
SP05x, SP72x, SP10xx, SP03-xx, SP600x,
SPLV2.8, SPLV2.8-4
Varistor (MLV) ML, MLE, MLN, MHS
TVS Diodes
SMBJ, P6SMB
Overcurrent PTCs
0805L, 1206L, 1210L, 1812L
High-Speed
Data Interfaces:
USB 2.0 / 3.0,
IEEE 1394, HDMI, eSATA,
InfiniBand, DisplayPort,
RF antenna
ESD, EMI, EFT IEC61000-4-2,
IEC61000-4-4
PulseGuard
®
ESD PGB1, PGB2
SPA™
Devices SP10xx, SP30xx
Overcurrent PTCs
0805L, 1206L, 1210L, 1812L
Power Inputs:
120/240 VAC
Lightning IEC61000-4-5
TVS Diode SMAJ, SMBJ, SMCJ, SMDJ
Varistor (MOV) LA, UltraMOV, C-III, TMOV
Overcurrent Fuse
SMD: Nano Fuse, Pico SMD fuse
Leaded: 2AG, 3AG, 5x20, 3.6x10, TR-5/
TE-5
Power Inputs:
Low Voltage DC
Lightning / ESD IEC61000-4-2,
IEC61000-4-5
TVS Diode SMAJ, SMBJ, SMCJ, SMDJ
Varistor (MLV) ML, MLE
Varistor (MOV) ZA
Overcurrent
Fuse SMD - Thin Film, Ceramic Chip, Nano
(1206 size)
PTC
SMD - xxxxL series
Radial - 30R / 60R series
Battery Strap
CONSUMER ELECTRONIC PRODUCT APPLICATIONS
Computers—Server, Desktop, Notebook, Netbook
Peripherals—Scanner, Printer, Monitor, Disk Drive
Handheld Portables—Cell Phone/Smart Phone/PDA, PND/GPS, MP3/PMP, Digital Camera/Camcorder, e-Book
Video Equipment—LCD/PDP TV, DVD, DVR/set top box
7
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Application Solutions Lists
Circuit Type Function or Threat Littelfuse Product Series
Type 1 (Power before the panel)
Power Meter Lightning Varistor (MOV) C-III
Type 2 (Permanently connected devices after the panel)
Uninterruptible Power Supply
(commercial/industrial)
TVSS Protection Modules
(building level equipment)
Power Inverters
Lightning, Switching Transients
Varistor (MOV) TMOV
®
, UltraMOV™, LA, C-III, HA, HB34, HF34, HG34
TVS Diode 5KP, 15KPA, 20KPA, AK6, AK10, 30KPA
GDT AC120, AC240
Power Fault / Short Circuit and other
themal events Fuse Powr Gard Midget fuses
LVSP series (MOV protection)
Type 3 (Plug-in equipment after the panel)
Uninterruptible Power Supply
(consumer/residential)
External Power Supplies
(chargers, peripheral devices, etc)
Consumer Electronics
AC Appliances
AC Power Strips
Switch Mode Power Supplies
Lightning, Switching Transients
Varistor (MOV) TMOV
®
, UltraMOV™, LA, C-III, HA, HB34, HF34, HG34
TVS Diode 5KP, 15KPA, 20KPA, AK6, AK10, 30KPA
GDT CG3 4.0
Power Fault / Short Circuit and other
themal events Fuse
Thru Hole: TR-5/TE-5, 2AG, 3AG, 5x20, 3.6x10
Surface Mount: Nano, Pico SMD
POWER MAINS / AC LINE PROTECTION*
Circuit Type Function or Threat Littelfuse Product Series
LED Lighting Systems
Improved LED Array Reliability PLED devices PLEDxx
Power Supply (Lightning, Inductive
Load Switching)
Varistor (MOV) TMOV, UltraMOV, CH, LA, C-III
TVS Diode SMBJ, P6KE, 1.5KE, 5KP, 15KPA, 30KPA, AK6, AK10
Power Fault / Short Circuit and
other themal events Fuse
Thru Hole: TR-5/TE-5, 2AG, 3AG, 5x20, 3.6x10
Surface Mount: Nano, Pico SMD
(High Voltage DC) 477 series, 505 series
Light Dimmers
Phase Control Thyrsitor Triacs / Alternistor Triacs: Q6010Lx, Q6016Lx, Q6025Lx
Quadracs: Q6010LT, Q6015LT
Trigger Function Thyristor Diacs: HT-32B, HT-34B
Overcurrent (Europe) Fuse 3.6x10
Electronic Fluorescent
Lighting Ballasts
Trigger Function Thyristor Diac: HT-32B
Lightning Varistor (MOV) LA
Overcurrent Fuse 383 TE-5 series / 369 TR-5 series, 446/447 EBF fuse
Compact Fluorescent Lamps (CFL) Overcurrent Fuse 3.6x10
Metal Halide Lighting Lamp Ignition Thyristor Multipulse Sidac: K2401G
High Pressure Sodium Lighting Lamp Ignition Thyristor Sidac: K1200G
LIGHTING SYSTEMS
Circuit Type Function or Threat Littelfuse Product Series
Universal / DC Motors
(intermittant use) Speed Control Thyristor
Triac: Q6016LH4
SCR: S6025L
Rectifier: D6025L
AC Induction Motors
(continuous use)
Speed Control Thyristor Triac: Q6012LH4
Thyristor Overvoltage Protection
Varistor (MOV) LA
TVS Diode SMBJ, P6KE, 1.5KE
ELECTRIC MOTORS*
* Littelfuse offers protection solutions to serve a wide range of electric motors, controllers and power systems. Please consult with your Littelfuse products
representative for detailed discussion about your requirements. For higher power and industrial applications, please refer to our POWR-Gard® division
product catalogs (www.littelfuse.com/catalogs).
8
Application Solutions by Circuit Type and Related Threat (continued)
Circuit Threat Standards Littelfuse Product Series
Medium/Low-Speed
Data Interfaces:
USB 1.1, Ethernet,
RS-232, RS-485
ESD, EMI, EFT
IEC61000-4-2
IEC61000-4-4
IEC61000-4-5
SPA™
Devices SP05x, SP72x, SP10xx, SP03-xx, SPLV2.8, SPLV2.8-4
Varistor (MLV) ML, MLE, MLN, MHS
TVS Diodes
SMBJ, P6SMB
Overcurrent PTCs
0805L, 1206L, 1210L, 1812L
High-Speed Data
Interfaces:
USB 2.0 / 3.0,
IEEE 1394,
RF antenna
ESD, EMI, EFT IEC61000-4-2,
IEC61000-4-4
PulseGuard
®
ESD PGB1, PGB2
SPA™
Devices SP10xx, SP30xx
Overcurrent PTCs
0805L, 1206L, 1210L, 1812L
SLICs
(Subscriber Line
Interface Circuits):
CO sites, Remote
Cabinets/Terminals,
VoIP systems,
FXS ports
Lightning
GR-1089, TIA-968-A, ITU
K.20/.21,
UL/EN/IEC 60950-1,
UL 497B,
IEC 61000-4-5,
YD/T-993
SIDACtor
®
Devices
Pxxx1 Fixed Voltage SLIC Protectors
Bxxxx Battrax® Programmable SLIC Protectors
Power Fault
Fuses TeleLink 461
PTCs 600R150
Telecom Low-Speed
Circuits:
Voice, Fax, Modem,
FXO / DAA
Lightning GR-1089, TIA-968-A, ITU
K.20/.21,
UL/EN/IEC 60950-1,
UL 497B,
IEC 61000-4-5,
YD/T-993
SIDACtor
®
Devices
Pxxxx SIDACtor Protectors
SDP series low profile SIDACtor Protectors
GDTs SL0902, SL1002, SL1003, SL1011, SL1024
Power Fault
Fuses TeleLink 461
PTCs 600R150
Telecom Medium-
Speed Circuits:
T1/E1/J1/DS1,
T3/E3/DS3,
10BaseT, ADSL, HDSL
Lightning
GR-1089, TIA-968-A, ITU
K.20/.21,
UL/EN/IEC 60950-1,
UL 497B,
IEC 61000-4-5,
YD/T-993,
IEEE 802.3
SIDACtor
®
Devices
PxxxxxxMCL SIDACtor Protectors
Pxxx2xxMCL TwinChip
®
Protectors
PxxxxQxx QFN SIDACtor Protectors
SDP, SEP series low profile SIDACtor Protectors
GDTs SL0902, SL1002, SL1003, SL1011, SL1024
Power Fault
Fuses TeleLink 461 / 461E
PTCs 600R150
Telecom High-Speed
Circuits:
ADSL2, ADSL2++, shdsl,
VDSL, VDSL2,
100BaseT, 1000BaseT
Lightning
GR-1089, TIA-968-A, ITU
K.20/.21,
UL/EN/IEC 60950-1,
UL 497B,
IEC 61000-4-5,
YD/T-993,
IEEE 802.3
SIDACtor
®
Devices SDP, SEP series low profile SIDACtor Protectors
GDTs SL0902, SL1002, SL1003, SL1011, SL1024
Power Fault
Fuses TeleLink 461 / 461E
PTCs 600R150
Telecom Medium/High-
Speed Driver Circuits:
xDSL, Ethernet
Lightning
GR-1089, TIA-968-A, ITU
K.20/.21,
IEC 61000-4-5,
YD/T-993,
IEEE 802.3
SIDACtor
®
Devices
SDP0242Q12F QFN protector
SEP series low profile SIDACtor Protectors
SPA™
Devices SP03-xx, SP3050-04HTG, SPLV2.8, SPLV2.8-4
Telecom Primary
Protection
Lightning and Power
Fault
UL497
GR-974
UL/EN/IEC 60950-1
GDT SL1002, SL1003, SL0902, SL1411
SL1011, SL1021, SL1022, SL1024
Power Inputs:
120/240 VAC, up to
120 VDC
Lightning
TVS Diode P6KE, 1.5KE, AK6, AK10
Varistor (MOV) CH, ZA, UltraMOV
Fault Current Fuse
Midget Series (SFE, KlK, KLKD, BLS, BLN, FLQ, FLM,
FLA, KLQ)
Fast Acting: 435, 431/434, 429/433, 271,
446, 445, 452/453, 456, 459
Slo-Blo: 430, 452/454, 456, 436, 461, Pico 2
TELECOM/DATACOM
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Circuit Type Function or Threat Standards Littelfuse Product Series
High-Speed Interfaces:
USB 2.0, IEEE 1394 ESD —PulseGuard
®
ESD PGB1, PGB2
SPA™ Devices SP30xx
Medium/Low-Speed
Interfaces:
USB 1.1, CAN
ESD, EMI —
SPA™ Devices SP05x, SP72x, SP10xx
Varistor (MLV) ML, MLE, MLN, MHS
Power Inputs:
Up to 42 VDC
Fault Currents
RoHS; ISO 7637;
GM 9105; Various UL,
CSA, IEC, MITI
Fuse
Blade / Terminal Fuse Series:
257, 297, 298, 299, 495, 498
(see automotive products catalogs)
Load Dump
and Inductive Switching —
Varistor (MLV) AUML
TVS Diode P6KE, P6SMB, 5KP, 1KSMB, SLD
Varistor (MOV) CH, ZA
AUTOMOTIVE ELECTRONICS*
Engine/Body/Chassis Controllers — Anti-lock brake / steering / air bag / seat belt / collision control and
other safety systems and sensors, lighting / signalling controls, instrument cluster, engine / emission
controllers, window / wipers controls, door lock / security controls, seating sensors and controllers
Multimedia/Information Systems — In-dash stereo / GPS / climate control electronics, portable GPS,
portable CD/DVD/media players, audio / video / data / power docks and inputs
Circuit Type Function or Threat Littelfuse Product Series
AC Induction Motor On / Off / Speed Control Switching Thyristor Alternistor Triac
AC Shaded Pole Motor Fan On / Off / Speed Control Switching Thyristor EV Series Triac
AC Solenoid Valve / Lock
On / Off Switching Thyristor EV Series Triac
Spike Suppression Varistor (MOV) LA
Brushless DC Motor Drive DC Supply Protection TVS Diode 1.5KE / 1.5SMC
Display / Touchscreen ESD Protection Varistor (MLV) ML
Gas Ignitor
Free-Running Oscillator Switching Thyristor K2xxxyH Series SIDAC
Micro-controller Fired Switching Thyristor EC Series SCR
Heating Element On / Off / Variable Switching Thyristor HQ Series High Temp Triac
Incandescent Bulb On / Off / Dim Switching Thyristor L-Series Triac
LED Indicator / Light ESD Protection Varistor (MLV) ML
MicroController I/O ESD Protection Varistor (MLV) ML
Sensor ESD Protection Varistor (MLV) ML
Switch-Mode Power Supply
AC Input Overcurrent Fuse Cartridge, PICO II, Nano
Input Overvoltage Varistor (MOV) LA
Output Overcurrent Fuse 477, 505 HV DC Cartridge
Output Overvoltage TVS Diode 1.5KE / 1.5SMC
Touch Keypad ESD Protection Varistor (MLV) ML
Triac Control Overvoltage Protection
TVS Diode 1.5KE / 1.5SMC
Varistor (MOV) LA
Wax Motor Latch / Lock On / Off Switching Thyristor EV Series Triac
WHITE GOODS / APPLIANCES
* Littelfuse offers a wide range of solutions designed to serve the requirements of automotive, truck, and off-road vehicle applications. Please refer to our automotive
products catalogs (www.littelfuse.com/catalogs) and your Littelfuse products representative for detailed discussion about your requirements.
10
Overcurrent Protection Technologies Product
Specifications and
Selection Guide
FUSE PRODUCTS www.littelfuse.com/fuse
Fuses provide protection by completely stopping the ow of energy to sensitive circuits. If current exceeds the fuse’s operating range, the metal
wire or strip melts safely within an enclosure. Littelfuse offers the most extensive range of fuses available, and for easy replacement of cartridge
fuses Littelfuse offers a wide selection of fuseholders including panel mount, in-line, and surface and thru-hole circuit board mount devices.
See page 12 for fuseholder selection.
Series
Name1Size2
Time Lag (Slo-Blo®)
Fast Acting
Very Fast Acting
Device Range 3
(Operating
Current Options
in Amps)
Max. Voltage
Rating 3
(Volts)
Interrupting
Rating at
Max. Voltage
Rating 3
(Amps)
Operating
Temperature
Range
Agency
Approvals 3
Halogen Free
RoHS Compliant
Lead Free
UL
UR
CSA
PSE
UMF
Surface Mount:
Ceramic Chip
437 1206 •0.25 - 8 125 / 63 / 32 50
-55°C to +150°C
• • • •
438 0603 •0.25 - 6 32 / 24 50 • • • •
440 1206 •1.75 - 8 32 50 •• •••
441 0603 •2 - 6 32 50 •• •••
469 1206 •1 - 8 24 / 32 24 - 63 •• •••
501 1206 •15, 20 24 150 • • • •
Thin Film
466 1206 •0.125 - 5 125 / 63 / 32 50
-55°C to +90°C
• • • •
429 1206 •7 24 35 • • • •
468 1206 •0.5 - 3 63 / 32 35 - 50 •• •••
467 0603 •0.25 - 5 32 35 - 50 •• •••
435 0402 •0.25 - 5 32 35 •• •••
Nano2®
448 2410 •0.062 - 15 125 / 65 35 - 50
-55°C to +125°C
• • • •
449 2410 •0.375 - 5 125 50 • • •
451 / 453 2410 •0.062 - 15 125 / 65 35 - 50 •••• ••
452 / 454 2410 •0.375 - 5 125 50 ••• ••
456 4012 •20, 30, 40 125 100 • • • • •
458 1206 •1.0 - 10 63 50 • • • •
443 4012 •0.5 - 5 250 50 • • • •
464 4818 •0.5 - 6.3 250 100 ••••
465 4818 •1 - 6.3 250 100 ••••
Telelink® 461 4012 0.5 - 2.0 600 60 -55°C to +125°C
• • • •
461E 4012 1.25 600 60 • • •
OMNI-BLOK®154 * •0.062 - 10.0 125 35 - 50 -55°C to +125°C
• • • •
154T * •0.375 - 5 125 50 • • • •
Fuse and Clip
Assemblies
157 * •0.062 - 10 125 35 - 50
-55°C to +125°C
• • • •
157T * •0.375 - 5 125 50 • • • •
159 * 0.5 - 2 600 60 • • •
160 * •0.5 - 5 250 50 • • •
PICO® SMF 459 * •0.062 - 5 125 50 - 300 -55°C to +125°C
• •
460 * •0.5 - 5 125 50 • •
Flat Pak 202 * •0.062 - 5 250 50 -55°C to +125°C
• •
203 * •0.25 - 5 250 50 • •
EBF 446 * •2.0 - 10.0 350 100 -40°C to +125°C
• •
447 * •2.0 - 10.0 350 100 • •
(1) Detailed information about most product series listed here can be found on our web site by entering www.littelfuse.com/series/(Series Name).html
(2) Size for these surface mount items refers to common industry length and width dimensions of the device surface area. Example: 0402 = .04” x .02”
(3) In some cases for these categories the ratings, agency approvals and specifications vary by part number and are presented here as ranges representing the whole series.
Please refer to product data on www.littelfuse.com and in our data sheets for detailed information by part number.
* Please refer to data sheet for detailed specifications.
11
Series
Name1
Time Lag (Slo-Blo®)
Medium Acting
Fast Acting
Very Fast Acting
Device Range 3
(Operating
Current Options
in Amps)
Max. Voltage
Rating 3
(Volts)
Interrupting
Rating at
Max Voltage
Rating 3
(Amps)
Operating
Temperature Range
Agency Approvals 3
RoHS Compliant
Lead Free
Americas Europe Asia
UL
UR
CSA
QPL
CE
VDE
TUV
BSI
Semko
PSE
K
CCC
CQC
Radial Leaded / Socket:
MicroTM /
TR3®
262/268/269 •0.002 - 5 125 10,000 -55°C to +125°C •••
272/278 •0.002 - 5 125 10,000 -55°C to +125°C •••
273/274/279 •0.002 - 5 125 10,000 -55°C to +85°C
303 •0.5 - 5 125 50 -55°C to +70°C • • • •
TR5®
370 •0.4 - 6.3 250 35 - 50
-40°C to +85°C
• • • • • • •
372 •0.4 - 6.3 250 35 - 50 • • • • • • • • •
373 •0.5 - 10 250 50 • • • •
374 •0.5 - 10 250 50 • • • •
382 •1 - 10 250 100 • • • • • • • • •
383 •1 - 10 300 50 - 100 • • • • •
TE5®
369 •1 - 6.3 300 50
-40°C to +85°C
• • • •
385 •0.35 - 1.5 125 50 • • •
391 •0.125 - 4 65 50 • • •
392 •0.8 - 6.3 250 25 - 63 • • • • • • • •
395 •0.05 - 6.3 125 100 • • •
396 •0.05 - 6.3 125 100 • • • •
397 •0.35 - 1.5 125 50 • • •
398 •0.125 - 4 65 50 • • •
399 •0.125 - 4 65 50 • • •
400 •0.5 - 6.3 250 130 • • • • •
808 •1 - 5 250 100 • • •
Axial Leaded / Cartridge:
PICO /
PICO II
Axial
251/253 •0.062 - 15 125 300DC / 50AC
-55°C to +125°C
• • • • • •
275 •20 - 30 32 300DC / 50AC • • •
263 •0.062 - 5 250 50 • • • •
471 •0.5 - 5 125 50 • • • •
472 •0.5 - 5 125 50 • •
473 •0.375 - 7 125 50 • • • •
265/266/267 •0.062 - 15 125 300DC / 50AC • • • •
316 •0.5 - 5 125 50 • •
3.6x10 mm
874 •0.1 - 10 250 50
-55°C to +125°C
• • •
875 •0.1 - 10 250 50 • • •
876 •0.125 - 5 250 35 - 50 • • • •
877 •2 - 6.3 250 35 - 63 • • • •
4.5x14.5
mm
(2AG)
208 •0.125 - 10 350 100
-55°C to +125°C
• • • • •
209 •0.25 - 1 350 100 • • • • •
224/225 •0.1 - 10 250 / 125 35 - 500 • • • • • • •
229/230 •0.25 - 7 250 / 125 35 - 400 • • • • • • •
5x20
mm
217 •0.032 - 15 250 35 - 150
-55°C to +125°C
•• •• ••••• • •
218 •0.032 - 16 250 35 - 100 •• •• ••••• • •
213 •0.2 - 6.3 250 35 - 63 • • • • • • • • • •
219XA •0.4 - 6.3 250 150 • • • • • • • • • •
216 •0.05 - 16 250 750 - 1500 •• •• ••••• • •
215 •0.125 - 25 250 300 - 1500 •• •• ••••• • •
232 •1 - 10 250 / 125 300 / 10,000 • • • • •
235 •0.1 - 7 250 / 125 35 - 10,000 • • • • • • •
233 •1 - 10 125 10,000 • • • • • • •
234 •1 - 10 250 100 - 200 • • • • • • •
239 •0.08 - 7 250 / 125 35 - 10,000 • • • • • • •
285 •0.125 - 20 250 400 - 1500 •
477 •0.5 - 16 400DC / 500AC 100 - 1500 • • • • • •
6.3x32 mm
(3AG/3AB)
312/318 •0.01 - 35 250 / 125 / 32 35 - 300
-55°C to +125°C
• • • • • • • •
313/315 •0.01 - 30 250 / 125 / 32 35 - 300 • • • • • • • •
314/324 •0.125 - 40 250 35 - 1000 • • • • • • • •
322 •1 - 30 250 / 65 100 - 1000 • • • • •
325/326 •0.01 - 30 250 / 125 100 - 600 • • • • • • • •
388 •1 - 30 250 100 • • • • •
505 •10 - 30 450 / 500 20,000 - 50,000 • • • •
Overcurrent Protection Guide
12
www.littelfuse.com
Overcurrent Protection Guide
FusehoLdeR seLeCtioN guide www.littelfuse.com/fuseholders
Circuit Connection Method Wire Wire Connector Terminals TH= Thru-Hole Solder SM= Surface Mount Solder ST= Screw Terminal
CT= Wire Connector Terminal RS= Rivet/Screw Hole
Fuseholder Type In- Line
Fuseholders
Panel Mount
Fuse Enclosure
Circuit Board Mount
Fuse Enclosure Fuse Blocks Fuse Clips
Fuse Type
Fuse Series
4.5x14.5
mm
(2AG)
225
229
150274 245001 Solder QC TH 254101 TH 111501
245002 NEMA QC TH 254121 SM 111505
286377 Flip Top CT Other 254 Series TH 111506
345 Series Int. Shock-Safe (old)
3452 Series Int. Shock-Safe
5x20
mm
213
215
216
217
218
219XA
232
233
234
235
239
150274 3455 Int. Shock-Safe TH 345121 Shocksafe TH 520 101 TH 04450001 / 00300210
345121 Int. Shock-Safe TH 646 / 649 / 656 Series CT 520 003 - 005 TH 05200001
286677 Flip Top TH 810 / 811 / 814 Series CT 647 Series TH 51800001009
800 / 801 / 802 / 821 Series TH 830 / 831 / 834 Series SM 658 Series TH 51900001009
820/820 - 20 Series Mini Shocksafe TH 852 / 853 / 862 Series TH 52000001009
823 Series Snap-in TH OPTF Series TH 52100001009
824/824-20 / 850 / 851 / 860 series TH 100 / 111 Series
870 Series Medical Grade TH 523 / 445 Series
6.3x32
mm
(3AB/3AG)
312
313
314
322
326
150322 342006 Watertight TH 345101 Shocksafe CT 354 Series RS 101001 / 101002
150 Series 342021 (FHN26W) Water Tight TH 354101-GY ST 356 Series RS 101003 / 102064
155 Series 342024 (FHN26G2) Drip Proof TH 810 Series ST 359 Series TH 102071 / 102074
LHFB Series 342025 (FHN20G) Drip Proof TH 811 Series TH 102076 / 102078
346877 Flip Top TH 814 Series TH 102079 / 102080
340 Series RF Shielded / Watertight TH 862 Series RS 121001 / 121002
342 Series Traditional RS 121004
344 Series Snap / Panel Mount TH 100058 / 122083
345 Series Int. Shocksafe (old) TH 122087 / 122088
3453 Series Int. Shocksafe TH 122090 / 122093
348 Series Snap Mount TH 10207101009
800 Series Shocksafe TH 51800001009
801 / 802 / 803-01 Series
860 Series
TE5
®
/
TR5
®
369 / 370
372 / 373
374 / 382
383 / 385
391 / 392
395 / 396
397 / 398
399 / 400
808
570 Series TH 571 0000 000
TH 559 / 560 / 562 Series
SM 564 Series
TH 576 Series
Micro
™
/
TR3
®
262 / 268
269 / 272
273 / 274
278 / 279
282001 Front mt. Neoprene TH 281005 Vertical Silver
282007 Front mt. Conductive TH 281007 Horizontal Silver
282002 Rear mt. Neoprene TH 281008 Vertical Tin
282008 Rear mt. Conductive TH 281010 Horizontal Tin
280004 32V indicating
13
Overcurrent Protection Technologies (continued)
PtC PRoduCts www.littelfuse.com/ptc
PTCs (positive temperature coefcient thermistors) increase resistance as temperature increases. They are designed to prevent
unsafe levels of current while allowing constant safe current levels, and their resistance will “reset” automatically when the
current and temperature returns to a safe level. PTCs are typically used in applications where automatic reset is desired.
Series Name1Size2Hold Current (IHOLD)Max voltage
(VMAX)
Max fault
current (IMAX)
Operating
Temperature
Range
Agency
Approvals
Halogen Free
RoHS
Lead Free
cURus
TUV
Surface Mount:
LoRho
(Low Resistance)
0805
1206
1210
1812
1.1 A
1.1 - 1.5 A
2.0 A
1.9 A
6 V 50 A
-40°C to 85°C
• • • • •
0603L 0603
(1608) 0.10 - 0.35 A 6 - 15 V 40 A • • • • •
0805L 0805
(2012) 0.10 - 1.10 A 6 - 15 V 100 / 40 A • • • • •
1206L 1206
(3216) 0.125 - 1.50 A 6 - 30 V 100 A • • • • •
1210L 1210
(3225) 0.05 - 1.50 A 6 - 30 V 10 / 100 A • • • • •
1812L 1812
(4532) 0.10 - 2.60 A 6 - 60 V 10 / 20 / 100 A • • • • •
2016L 2016
(5041) 0.30 - 2.00 A 6 - 60 V 20 / 40 A • • • • •
2920L 2920
(7351) 0.30 - 3.00 A 6 - 60 V 10 / 40 A • • • • •
250S see data sheet 0.13 A 60 V 3 A • • • •
Radial Leaded:
USBR
see data sheet
0.75 - 2.50 A 6 / 16 V 40 A
-40°C to 85°C
• • • •
16R 2.50 - 14.00 A 16 V 100 A • • • •
30R 0.90 - 9.00 A 30 V 40 A • • • •
60R 0.10 - 3.75 A 60 V 40 A • • • •
72R 0.20 - 3.75 A 72 V 40 A • • • •
250R 0.08 - 0.18 A 250 V 3 / 10 A • • • •
600R 0.15 - 0.16 A 600 V 3 A • • • •
Battery Strap:
SL
(Low Resistance)
see data sheet
1.9 A 6 V 50 A
-40°C to 85°C
• • • • •
LR 1.90 - 7.30 A 15 / 20 V
100A
• • • •
LT 0.70 - 3.40 A 15 / 24 V • • • •
ST 1.20 - 4.20 A 15 / 30 V • • • •
VL 1.70 - 2.30 A 12 V • • • •
VT 1.70 - 2.40 A 16 V • • • •
(1) Detailed information about most product series listed here can be found on our web site by entering www.littelfuse.com/series/(Series Name).html
(2) Size for these surface mount items refers to common industry length and width dimensions of the device surface area. Example: 0402 = .04” x .02”
14
www.littelfuse.com
14
Overvoltage Suppression Protection
VARistoR PRoduCts www.littelfuse.com/varistor
Shorthand for “Variable Resistors,” Varistors possess characteristics that divert transient currents away from sensitive components.
Littelfuse offers two types: Miniature surface mount Multi-Layer Varistors (MLVs) for small electronics applications and Metal Oxide
Varistors (MOV) for higher energy applications.
Series Name1Technology
Type
Operating
AC Voltage
Range
Operating
DC Voltage
Range
Peak Current
Range2 (A)
Peak Energy
Range (J)
Operating
Temperature
Range
Lines
Protected
Mount/
Form Factor Disc Size
Agency Approvals
RoHS
Lead Free
Halogen
Free
UL
CSA
VDE
CECC
QPL
Surface Mount MLV / MOV:
MHS
Multi-Layer
Zinc Oxide
(MLV)
9 - 42 30 - 135 300
-55 to
+125°C
1
Surface
Mount
Not
Applicable
•
MLE 18 18 22 - 28 •
ML 2.7 - 107 5.5 - 120 4 - 500 0.02 - 2.5 •
AUML 18 •
MLN 18 5.5 - 18 30 0.05 - 0.10 4 •
CH
Zinc Oxide
(MOV)
14 - 275 18 - 369 100 - 250 1.0 - 8.0
1
• •
SM7 275 - 510 369 - 675 1200 23 - 40 • • •
SM20 20 - 320 26 6500 165 • • • •
Radial Leaded MOV:
TMOV®/
iTMOV®
Zinc
Oxide
115 - 750 6000 -
10000 35 - 480
-55 to +85°C 1 Radial
Leaded
14, 20mm •••• ••
TMOV®
25S 115 - 750 20000 170 - 670 25mm
Pending
• •
UltraMOVTM 130 - 625 170 - 825 1750 -10000 12.5 - 720 7, 10, 14
20mm •••• •• •
UltraMOVTM 25S 115 - 750 150 - 970 22000 230 - 890 25mm •••• ••
C-III 130 - 660 3500 - 9000 40 - 530 10, 14, 20mm • • • • • •
LA 130 - 1000 175 - 1200 1200 - 6500 11 - 360 7, 10, 14
20mm •••• •• •
ZA 4 - 460 5.5 - 615 50 - 6500 0.1 - 52 5, 7, 10, 14,
20mm • • • • • •
Industrial High Energy Terminal MOV:
BA/BB
Zinc
Oxide
130 - 2800 175 - 3500 50000
70000 450 - 10000
-55 to +85°C 1
Screw /
Clip
Terminals
60mm • •
DA/DB 130 - 750 175 - 970 40000 270 - 1050 40mm • • •
HA 130 - 750 175 - 970 25000
40000 200 - 1050
Industrial
Packaged
Radial Leads
32, 40mm • • • • •
TMOV34S®115 - 750 40000 235 - 1050 34mm • • •
HB34,
HG34, HF34 130 - 750 175 - 970 40000 270 - 1050 34mm • • • • •
DHB34 250 - 2800 330 - 3500 20000
70000 330 - 10000 34mm • •
CA 250 - 2800 330 - 3500 20000
70000 330 - 10000 Bare Disc 60mm •
Specialty Application MOV:
MA
Zinc Oxide
9 - 264 13 - 365 40 - 100 0.06 - 1.7 -55 to +85°C
1
Axial Leaded Not
Applicable • • •
RA 4 - 275 5.5 - 369 100 - 6500 0.4 - 160 -55 to
+125°C
Inline Radial
Leads
Not
Applicable • • • •
High Reliability 130 - 510 4 - 675 100 - 6500 0.4 - 190 -55 to +85°C (Varies) (Varies) •
(1) Detailed information about most product series listed here can be found on our web site by entering www.littelfuse.com/series/(Series Name).html
(2) Not an applicable parameter for Crowbar devices
15
Overvoltage Suppression Guide
www.littelfuse.com
gdt (gAs disChARge tube) PRoduCts www.littelfuse.com/gdt
GDTs dissipate voltage transients through a contained plasma gas. They have high insulation resistance plus low capacitance and leakage
to ensure minimal effect on normal operation of equipment. Littelfuse devices offer a small footprint and are available in leaded and surface
mount congurations, with high surge handling capability. Their fast response to transient over-voltage events, and ability to dissipate large
amounts of energy, translates into reduced risk of equipment damage. The amount of energy they can dissipate makes them a good choice for
lightning surge protection, particularly for telecomm equipment located in outdoor structures.
Series
Name1
DC Breakover
Voltage Range
(Nom VBO)
Max AC
Surge Rating
Peak Pulse
Current
(8x20µs)
Max
Capacitance
Operating
Temperature Range
# Terminals
Mounting Options
RoHS Compliant
Lead Free
Mini Tube
Surface
Axial Lead
Radial Lead
Cartridge Clip
High Voltage GDTs
AC 285 - 600
NA
5000A 1.5pF
-40°C to +90°C
2• •
CG3 1000 - 7500 5000A 1.5pF 2 • •
Low to Medium Surge GDTs
CG5 90 - 600 5A 5000A 1.5pF
-40°C to +90°C
2• • • •
SL0902A 90 - 600 5A 5000A 1.5pF 2 • • • •
SL1002A 75 - 600 5A 5000A 1.2pF 2 • • • •
SL1003A 90 - 500 10A* 10,000A 1.2pF 3 • • • • •
SL1011A 75 - 600 5A 5000A 1.5pF 2 • • • •
Medium to High Surge GDTs
SL1122A 90 - 260 10A* 10000A* 100-270pF
-40°C to +90°C
3• •
SL1021A 90 - 600 10A* 10000A* 1.5pF 3 • • • •
SL1024A 90 - 600 10A* 10000A* 1.5pF 3 • • • •
PMT8 90 - 400 10A* 20000A* 1.5pF 3 • • • •
SL1011B 75 - 350 10A 10000A 1.5pF 2 • • • •
SL1411A 75 - 600 10A 10000A 1.5pF 2 • • • •
PMT3 90 - 500 20A* 20000A* 1.5pF 3 •••
CG/CG2 75 - 1000 20A 20000A 1.5pF 2 • • • •
Very High Surge GDTs
SL1021B 90 - 600 10A* 20000A* 1.5pF
-40°C to +90°C
3• • • •
SL1024B 90 - 600 10A* 20000A* 1.5pF 3 • • • •
SL1026 275 - 700 10A* 20000A* 2 •••
(1) Detailed information about most product series listed here can be found on our web site by entering www.littelfuse.com/series/(Series Name).html
* Total current through center (ground) terminal
16
Overvoltage Suppression Protection (continued)
esd suPPRessoR seLeCtioN guide www.littelfuse.com/esd
Littelfuse offer three product families for ESD suppression. Each provide distinct attributes for compatibility to specic circuit requirements.
PulseGuard® ESD Suppressors offer extremely low capacitance for use in high-speed data circuits (IEEE 1394, USB 2.0, HDMI, DVI, etc.). Available in
single-line and multi-line packages, they provide ESD protection while ensuring that signal integrity is maintained.
SPA™ Silicon Protection Arrays offer a high level of protection (up to 30kV per IEC 61000-4-2) with very low capacitance, leakage current and clamp
voltage. For more robust applications, SP03-xx and SP30xx devices are available for EFT and Lightning transient threats per IEC-61000-4-4/5.
Multi-Layer Varistors (MLVs) provide board level protection against ESD, EFT, and other transients that occur on power supply, data and control lines. Single
line devices are available in popular industry standard formats, and for more efcient board space usage, four-line devices are also available. Some MLVs also
offer low band-pass ltering characteristics that lter high frequency noise from the circuit.
Series
Name
Surface
Mount
Through-
Hole
Technology Type Working Voltage Array Package
(No. of Lines)
Single Line
Package
Typical Device
Capacitance
Leakage
Current
Rated
Immunity to
IEC 61000-4-
2 level 4
Also Rated
for EFT or
Lightning
Bidirectional
(transients
of either
polarity)
Performs Low
Pass Filtering
PulseGuard® ESD Suppressors:
PGB1 •Voltage Variable
Material 0–24VDC SOT23 (2) 0402,
0603 0.04–0.12pF <1nA • •
PGB2 •Voltage Variable
Material 0–12VDC NA 0402 0.07pF <1nA • •
SPA™ Silicon Protection Arrays: (Please refer to page 18 for additional information)
SP72x • • Silicon Controlled
Rectifier/Diode 0–35VDC PDIP, SOIC (6, 14)
SOT23 (4) NA 3–5pF <20nA • • •
SP03-xx •Silicon TVS Rail
Clamp Array 0–8VDC SOIC NA 16pF <25µA • • •
SP05x •Silicon TVS
Avalanche Diode 0–5.5VDC SOT23 (2, 4, 5), S0T143 (3),
MSOP (6), SC70 (2, 4, 5) NA 30pF <10µA • •
SP10xx •TVS Arrays 0–6VDC SC70 (2, 4, 5), SOT553 (2),
SOT563 (4), µDFN (4)
0201 (Flipchip),
0402 (SOD723) 3.5–30pF <0.5µA • • • (SP1005 only)
SP30xx •Diode Arrays 0–6VDC
SOT23 (4), SC70 (2, 4),
SOT553 (2), SOT563 (4),
MSOP10 (4), µDFN (4, 6)
NA 0.40–2.4pF <0.5µA • • •
SP600x •EMI / ESD Arrays 0–6VDC µDFN (4, 6, 8) NA 14–30pF <0.5µA • • • •
SPLV2.8 •Diode Arrays 0–2.8VDC SOIC (4) SOT23 (1) 3.8pF <1µA • • •
Multi-Layer Varistors (MLVs): (Please refer to page 14 for additional information)
ML •MLV
ZnO
0–120VDC
range by type NA 0402–1210 40–6000pF <25µA • • • •
MLE •MLV
ZnO 0–18VDC NA 0402–1206 40–1700pF <25µA • • • •
MHS •MLV
ZnO 0–42VDC NA 0402, 0603 3–22pF <5µA • • • •
MLN •MLV
ZnO 0–18VDC 0805 (4), 1206 (4) NA 45–430pF <5µA • • • •
Terms: EFT: Electrical Fast Transient TVS: Transient Voltage Suppressor
17
www.littelfuse.com
Part Number
QFN 3x3
DO-214
VBR breakdown
IH
Holding
Current
IS
Switching
Current
IT@VTVT @ IT = 1 Amp Critical rate of
rise dV/dt
Volts Volts mAmps mAmps Amps Volts Volts
Min Max Min Max Max
PLED6Q12 •
6 16
5 100 1.0 1.5 250V/µS
PLED6S •
PLED9Q12 •
9 18
PLED9S •
PLED13Q12 •
13 26
PLED13S •
PLED18Q12 •
18 33
PLED18S •
Part Number
QFN 2x2
SOT 89
VAK
Input
Voltage
VTO
Turn-On
Voltage
IS
Switching
Current
VOS
On-State
Voltage
VOSR
Reverse
On-State
Voltage
IOS
On-State
Current
IOSR
Reverse
On-State
Current
VESD
ESD Withstand
Voltage
(IEC61000-4-2)
Volts Volts mAmps Volts Volts mAmps mAmps kVolts
Max Min Typ Max Max Max Max Max Max Contact Air
PLED5Q12 •40
4.65 4.9 5.15 20
1.3@
IAK = 350 mA
1.4@
IAK = 350 mA 500 500 ± 8 ± 15
PLED5HT •38 1.8@
IAK = 700 mA
1.8@
IAK = 700 mA 700 700 ± 8 ± 15
PLED Light-Emitting DioDE (LED) ProtEctors www.littelfuse.com/pled
Littelfuse PLED devices provide added reliability to LED lighting strings. Designed to minimize the impact of loss of an
entire string of LEDs due to a single LED failure, PLED devices provide a switching function that will bypass LEDs that go
open circuit, and allow current to flow to the remaining LEDs in the string. PLED devices also offer LED protection against
electrostatic discharge (ESD) and accidental reverse power connection (PLED5 devices only). Designed to serve the needs of
high brightness outdoor LED lighting applications (advertising and traffic signs, roadway/pathway/runway lighting, aircraft
and emergency lighting, etc), PLED devices help assure reliability and lower maintenance requirements.
18
Overvoltage Suppression Protection (continued)
sPA™ siLiCoN PRoteCtioN ARRAYs www.littelfuse.com/spa
SPA™ devices are designed to protect analog and digital signal lines from electrostatic discharge (ESD) and other overvoltage
transients. Offering low dynamic resistance for improved clamping performance, SPA™ devices are offered in a wide range of industry
standard discrete and multi-channel SMD packages. Features of this portfolio include capacitance as low as 0.65 pF and enhanced ESD
capability up to 25kV (contact discharge).
Series
Name1Package Type Working
Voltage Resistance Capacitance Number of
Channels
ESD Rating
(Contact Discharge,
IEC61000-4-2)
VCLAMP
(8/20µs)
Cut Off
Frequency
8/20
Rating
Green Series
Lead Free
RoHS
Compliant
SCR (silicon controlled rectifier) / Diode Arrays:
SP720
PDIP, SOIC
2-30V 3pF 14 4kV 3 A • • •
SP721 2-30V 3pF 6 4kV 3 A • • •
SP723 2-30V 5pF 6 8kV 7 A • • •
SP724 SOT23 1-20V 3pF 4 8kV 3 A • • •
SP725 SOIC 2-30V 5pF 4 8kV 14 A • • •
TVS (transient voltage suppression) Discretes and Arrays:
SP05
SC70, SOT23,
SOT143, MSOP,
TSSOP
5.5V 30pF 2 / 3 / 4 / 5 / 6 30kV • • •
SP1001 SC70, SOT553
SOT563 6V 8pF 2 / 4 / 5 15kV 8.0V@1A 2 A • • •
SP1002 SC70 6.5V 5pF 1 / 2 8kV 9.2V@1A 2 A • • •
SP1003 SOD723 5V 30pF 1 25kV 12.5V@7A 7 A • • •
SP1004 SOT953 6V 5pF 4 8kV 10V@1A 1 A • • •
SP1005 0201 (Flipchip) 6V 30pF 1 30kV 9.3V@1A 10 A • • •
SP1007 0201 (Flipchip) 6V 3.5pF 1 8kV 10.3V@1A 2 A • • •
SP1010 µDFN
(1.25 x 1mm) 6V 3.5pF 4 8kV 9.8V@1A 1 A • • •
SP1011 µDFN 6V 7pF 4 15kV 8.7V@1A 2 A • • •
Low Capacitance Rail Clamp Diode Arrays:
SP3050 SOT23 6V 2pF 4 20kV 8.8V@1A 10 A • • •
SP3001 SC70 6V 0.65pF 4 8kV 9.5V@1A 2.5 A • • •
SP3002 SC70, SOT23,
µDFN 6V 0.85pF 4 12kV 9.5V@1A 4.5 A • • •
SP3003 SC70, SOT5x3,
MSOP10 6V 0.65pF 2 / 4 8kV 10.0V@1A 2.5 A • • •
SP3004 SOT563 6V 0.85pF 4 12kV 10.0V@1A 4 A • • •
SP3010 µDFN 6V 0.45pF 4 8kV 10.8V@1A 3 A • • •
SP3011 µDFN 6V 0.40pF 6 8kV 11.0V@1A 3 A • • •
High Surge Arrays for Broadband Protection:
SP03-3.3
SO-8
3.3V 16pF 2
30kV
15V@100A
150 A
• • •
SP03-6 6V 16pF 2 20V@100A • • •
SP03-8 8V 15pF 2 22V@100A • • •
SPLV2.8 SOT23 2.8V 3.8pF 1 15V@24A • • •
SPLV2.8-4 SO-8 2.8V 3.8pF 4 15V@24A • • •
EMI / ESD Array:
SP6001 µDFN 100Ω24pF 4 / 6 / 8 30kV 115MHz • • •
SP6002 µDFN 100Ω30pF 4 / 6 30kV 100MHz • • •
SP6003 µDFN 100Ω14pF 4 / 6 15kV 175MHz • • •
(1) Detailed information about most product series listed here can be found on our web site by entering www.littelfuse.com/series/(Series Name).html
19
www.littelfuse.com
tRANsieNt VoLtAge suPPRessioN (tVs) diodes www.littelfuse.com/tvsdiode
TVS Diodes are used to protect semiconductor components from high-voltage transients. Their p-n junctions have a larger
cross-sectional area than those of a normal diode, allowing them to conduct large currents to ground without sustaining damage.
Littelfuse supplies TVS Diodes with peak power ratings from 400W to 15kW, and reverse standoff voltages from 5V to 376V.
Series
Name1Package Type Reverse Standoff
Voltage (VR)
Peak Pulse Power
Range 2 (PPP)
Peak Pulse Current
(IPP 8x20µs) Operating Temperature
Halogen Free
RoHS Compliant
Surface Mount - Standard Applications (400-5000W):
SMAJ DO-214AC 5.0 - 440 400W
Not Applicable -85° to +302° F
(-65° to +150° C)
• •
P4SMA DO-214AC 5.8 - 495 400W • •
SACB DO-214AA 5.0 - 50 500W • •
SMBJ DO-214AA 5.0 - 440 600W • •
P6SMB DO-214AA 5.8 - 495 600W • •
1KSMB DO-214AA 5.8 - 136 1000W • •
SMCJ DO-214AB 5.0 - 440 1500W • •
1.5SMC DO-214AB 5.8 - 495 1500W • •
SMDJ DO-214AB 5.0 - 170 3000W • •
5.0SMDJ DO-214AB 12-170 (uni-directional)
12-45 (bi-directional) 5000W • •
Axial Leaded - Standard Applications (400-5000W):
P4KE DO-41 5.8 - 495 400W
Not Applicable -85° to +302° F
(-55° to +175° C)
• •
SA DO-15 5.0 - 180 500W • •
SAC DO-15 5.0 - 50 500W • •
P6KE DO-15 5.8 - 512 600W • •
1.5KE DO-201 5.8 - 495 1500W • •
LCE DO-201 6.5 - 90 1500W • •
3KP P600 5.0 - 220 3000W • •
5KP P600 5.0 - 250 5000W • •
Axial Leaded - High Power:
15KPA P600 17 - 280 15000W
Not Applicable -85° to +302° F
(-55° to +175° C)
• •
20KPA P600 20.0 - 300 20000W • •
30KPA P600 28.0 - 288 30000W • •
AK6 Radial Lead 58 - 430 NA 6000A
-67° to +347° F
(-55° to +150° C)
• •
AK10 Radial Lead 58 - 430 NA 10000A • •
Automotive Applications:
SLD P600 10 - 24 2200 based on
1µs/150ms pulse NA -85° to +302° F
(-65° to +175° C) • •
(1) Detailed information about most product series listed here can be found on our web site by entering www.littelfuse.com/series/(Series Name).html
(2) For Maximum Clamping Voltage (VC) please refer to electrical characteristics table within each series data sheet
20
Overvoltage Suppression Protection (continued)
Series Name Package Type Type
Standoff
(working)
Voltage (VDRM)
Switching Voltage
(VS)
Peak Pulse Rating:
RoHS
Compliant
2x10µs 10x1000µs 8X20µs
Broadband Optimized Protection:
MC Series
DO-214AA
A 6 - 25 25 - 40 150A 45A 150A
•
C 6 - 320 25 - 400 500A 100A 400A
TO-92 C 6 - 320 25 - 400 500A 100A 400A
Modified TO-220 APin 1-2, 3-2: 6-275
Pin 1-3: 12-550
Pin 1-2, 3-2: 25-350
Pin 1-3: 50-700
150A 45A 150A
C 500A 100A 500A
Balanced
MC Series Modified TO-220 C Pin 1-2, 3-2, 1-3:
130-420
Pin 1-2, 3-2, 1-3:
180-600 500A 100A 400A •
Q2L Series
3x3 QFN A
6 - 320 25 - 400
150A 45A 150A
•
B 250A 80A 250A
3.3x3.3 QFN C 500A 100A 400A
MC Multiport Series MS-013 C 6 - 320 25 - 400 500A 100A 400A •
TwinChipTM Series
DO-214AA
A
220 - 640 300 - 800
150A 45A 150A
•
B 250A 80A 250A
DO-15
A
220 - 320 300 - 400
50A
B 80A
SDP TwinChipTM Series 3x3 QFN F 16 43 100 30A 80A •
SPD Series 5x6 QFN B 58 - 320 77 - 400 250A 80A 250A •
SDP Biased Series 5x6 QFN C 6 - 320 25 - 400 500A 100A 400A •
SEP Biased Series 5x6 QFN C 6 - 75 25 - 98 500A 100A 400A •
Subscriber Line Interface Circuit (SLIC) Protection:
Fixed Voltage Series DO-214AA A58 - 160 77 - 200 150A 45A 150A
•
C 500A 100A 400A
Fixed Voltage
Twin SLIC Series
Modified
DO-214AA A 58 - 160 77 - 200 150A 45A 150A •
Fixed Voltage
Q2L Series
QFN
3.3x3.3 C 58 - 160 77 - 200 500A 100A 400A •
Fixed Voltage
Single Port Series MS-012 F 58 - 95 77 - 130 120A 30A 100A •
Fixed Voltage Enhanced Single
Port Series MS-012 F 58 - 160 77 - 200 120A 30A 100A •
Fixed Voltage
Multiport Series MS-013 A58 - 160 77 - 200 150A 45A 150A
•
C 500A 100A 400A
Battrax® Series
Positive/Negative
Mod
DO-214AA
A
These devices track their
reference voltages.
Please refer to data sheets
in SIDACtor products catalog
or www.littelfuse.com
for detailed information.
150A 45A 150A
•
C 500A 100A 400A
Battrax® Series
Single Port Negative MS-013 C 500A 100A 400A •
Battrax® Series
Single Port Positive/Negative MS-013 C 500A 100A 400A •
Battrax® Series
Dual Port Negative MS-013 C 500A 100A 400A •
SIDACtor® PROTECTION THYRISTORS www.littelfuse.com/sidactor
SIDACtor® devices are designed to suppress overvoltage transients in telecom and datacom equipment, and are able to divert currents as
high as 5000A to ground within nanoseconds of reaching their breakover voltage. Littelfuse offers a wide range of congurations including
DO-214AA, COMPAK (3-Pin DO-214), QFN, MS-012 and modied MS-013 surface mount, TO-92, TO-218, DO-15, modied TO-220, and TO-220
through-hole package options designed to handle medium to high energy transients.
21
www.littelfuse.com
Series Name Package Type Type
Standoff
(working)
Voltage (VDRM)
Switching
Voltage (VS)
Peak Pulse Rating:
RoHS
Compliant
2x10µs 10x1000µs 8X20µs
Line Circuit Access Switch (LCAS) Protection:
Asymmetrical
Multiport Series MS-013
AThese products have asymmetric
trigger voltages. See data sheet.
150A 45A 150A
•
C 500A 100A 400A
Custom LCAS
Discrete Series DO-214AA
A
100 - 230 130 - 290
150A 45A 150A
•B 250A 80A 250A
C 500A 100A 400A
Baseband Protection (Voice-DS1):
SIDACtor®
Series
DO-214AA
A
6 - 320 25 - 400
150A 45A 150A
•
B 250A 80A 250A
C 500A 100A 400A
TO-92
A
6 - 320 25 - 400
150A 45A 150A
•
B 250A 80A 250A
C 500A 100A 400A
DO-15
A
90 - 320 130 - 400
45A
•
B 80A
Modified TO-220
APins 1-2,3-2:
25-275
Pins 1-3: 50-550
Pins 1-2,3-2:
40-350
Pins 1-3: 80-700
150A 45A 150A
•
B 250A 80A 250A
C 400A 100A 400A
SIDACtor®
Multiport
Series
MS-013
APins 1-2,3-2,4-5,6-5:
6-320
Pins 1-3,4-6: 12-640
Pins 1-2,3-2,4-5,6-5:
25-400
Pins 1-3,4-6: 50-800
150A 45A 150A •
C 500A 100A 400A •
SIDACtor®
Balanced
Series
MS-013 C 130 - 420 180 - 600 500A 100A 400A •
Modified TO-220
APins 1-2, 3-2:
130-420
Pins 1-3: 130-420
Pins 1-2, 3-2:
180-600
Pins 1-3: 180-600
150A 45A 150A
•
B 250A 80A 250A
C 400A 100A 400A
SIDACtor®
Balanced
Multiport
Series
MS-013
A
130 - 420 180 - 600
150A 45A 150A
•
B 250A 80A 250A
C 500A 100A 400A
Asym. A6 Pins 1-2,2-3,4-5,5-6:
170-400
Pins 4-6,1-3: 50-270
Pins 1-2,2-3,4-5,5-6:
250-550
Pins 4-6,1-3: 80-340
150A 45A 150A
Asym. B6 250A 80A 250A
Asym. C6 500A 100A 400A
T10A Series DO-15 A 50 - 245 84 - 370 50A 100A •
T10B Series DO-201 B 80 - 275 120 - 360 100A 250A •
High Exposure Surge Protection:
Primary Protection Series
Cell C 25 - 320 40 - 400 500A 100A 400A •
Modified TO-220 C
Pins 1-2,3-2:
25-275
Pins 1-3: 50-550
Pins 1-2,3-2:
40-350
Pins 1-3: 80-700
500A 100A 400A •
Primary Protection
Balanced Series Modified TO-220 C
Pins 1-2, 3-2:
130-420
Pins 1-3: 130-420
Pins 1-2, 3-2:
180-600
Pins 1-3: 180-600
500A 100A 400A •
5kA Series TO-218 E 140 - 180 180 - 260 5000A •
High Surge Current Series DO-214AA D 6 - 320 25 - 400 1000A 200A 800A •
22
Switching Technologies
Series Name1Thru-Hole Surface Mount
IT(RMS) VDRM/VRRM IGT (Q1)
Standard Sensitive Alternistor
TO-3
TO-92
TO-218 Isl
TO-218 Non-Isl
TO-218X Isl
TO-220 Isl.
TO-220 Non-Isl
TO-251
Compak
SOT-223
TO-252
TO-263
Triac:
QxX8Ex
QxXx
LxX8Ex,
LxXx • • 0.8 A
400 - 600 V
3 - 25 mA
LX8 • • 0.8 A 3 - 5 mA
Qx01Ex,
QxNx
Lx01Ex,
LxNx • • 1.0 A 3 - 25 mA
L01 • • 1.0 A 400 - 800 V 3 - 10 mA
Qxx04xx Lxx04xx • • • • 4 A
400 - 1000 V
3 - 25 mA
Qxx06xx Lxx06xx Qxx06xHx ••• •• 6 A 5 - 50 mA
Qxx08xx Lxx08xx Qxx08xHx ••• •• 8 A 5 - 50 mA
Qxx10xx Qxx10xHx • • • 10 A 25 - 50 mA
Qxx12xHx • • • 12 A 10 - 50 mA
Qxx15xx Qxx16xHx • • • 15 & 16 A 10 - 80 mA
Qxx25xx Qxx25xHx • • • • • • 25 A 50 - 80 mA
HQ6025xH5 • • • • 25 A 600 V 50 mA
Qxx35xx Qxx35xHx • • • • 30 & 35 A 400 - 800 V 50 mA
Qxx40xx • • 40 A 400 - 1000 V 80 - 100 mA
Quadrac:
QxxxxLT QxxxxLTH •4 - 15 A 400 - 600 V
Through-Hole Packages:
DO-15 DO-35 TO-92 TO-218 TO-218x TO-220 Mod. TO-220 TO-251 V-Pak
Surface Mount Packages: Other:
SOD-80
Minimelf SOT89 DO-214 Compak SOT223 TO-252 D-Pak TO-263 D2Pak TO-3 Fastpak
sWitChiNg thYRistoRs www.littelfuse.com/thyristor
Switching Thyristors are solid state switches that are normally open circuits (very high impedance), capable
of withstanding rated blocking/off-state voltage until triggered to on state. Often used for circuit (current)
control applications to protect from voltage transients, Littelfuse offers DIAC, TRIAC, QUADRAC, and other
congurations for a wide range of currents and rated blocking/off-state voltages.
23
www.littelfuse.com
Series Name1
Thru-Hole Surface
Mount Switching Vbo VBO
Symmetry VBB IHITSM static dv/dt di/dt TJ
Standard High Energy Multipulse
SIDAC:
Kxxxzy DO-15, TO-92 DO-214 79 - 330 V 150 mA
20 A 1500 V/µs 150 A/µs -40 to +125 °CKxxx0yH DO-15, TO-92 DO-214 190 - 280 V 150 mA
Kxxx1G DO-15 200 - 380 V 160 mA typ
DIAC:
HTxxx
HTMxxx
STxxx
DO-35 SOD-80 Minimelf,
DO-214 27 - 70 V down to
1 V
up to
10 V -40 to +125 °C
Series Name1Thru-Hole
IF(RMS) IF(AV) IFSM I2t Tstg
TJ
RMS
forward
current
Average
forward
current
Peak non-repetitive surge current I2t Value for
fusing
Storage
temperature
range
Rectifiers:
Dxx15L
Dxx20L
Dxx25L
TO-220 Isl. 15 - 25A 9.5 to
15.9A
single half cycle;
f = 50Hz;
TJ (initial) = 25°C
single half cycle;
f = 60Hz;
TJ (initial) = 25°C 210 - 508 A2s -40 to +150 °C -40 to +125 °C
188 - 300A 225 - 350A
Series Name1Thru-Hole Surface Mount
IT(RMS) VDRM/VRRM IGT (Q1)
Standard Sensitive
TO-92
TO-218X
TO-218AC
TO-220 Isl
TO-220 Non-Isl
TO-251
Compak
SOT-89
SOT-223
TO-252
TO-263
SCR:
EC103xx
SxSx • • 0.8 A 400 - 600 V 12 - 500 µA
SxX8xSx • • • 0.8 A 400 - 800 V 5 - 200 µA
Sx01E
SxN1 • • 1 A
400 - 600 V
10 mA
TCR22-x •1.5 A 200 µA
Sx02xS • • 1.5 A 200 µA
Sxx04xSx • • 4 A 50 - 500 µA
Sxx06x Sxx06xSx • • • • 6 A
400 - 1000 V
0.2 - 15 mA
Sxx08x Sxx08xSx • • • • 8 A 0.2 - 15 mA
Sxx10x Sxx10xSx • • • • 10 A 0.2 - 15 mA
Sxx12x • • • 12 A 20 mA
Sxx15x
Sxx16x • • • 15 & 16 A 30 mA
Sxx20x
Sxx25x • • • 20 & 25 A 30 - 35 mA
Sxx35x • • 35 A 40 mA
Sxx40x • • 40 A 40 mA
Sxx55x • • • • 55 A 40 mA
Sxx65x &
Sxx70x • • 65 & 70 A 50 mA
(1) Detailed information about most product series listed here can be found on our web site by entering www.littelfuse.com/series/(Series Name).html
Specifications descriptions and illustrative material in this literature are as accurate as known at the time of publication,
but are subject to changes without notice. Visit www.littelfuse.com for the most up-to-date technical information.
©2010 Littelfuse, Inc. Printed in USA
FORM NO. EC102
Revision Code: EC1102v1E1007
As the world's #1 brand in circuit protection, Littelfuse offers
the broadest
and deepest portfolio of circuit protection products and a global network
of technical support backed by more than 80 years of application design
expertise. Visit our design support center to access:
> Reference Designs
> Application Notes
> Application Testing
> SPICE Models
> Local Technical Support
> Product Samples
> Technical Articles
> Certification Documents
> Data Sheets
WWW.LITTELFUSE.COM/DESIGNSUPPORT
PRODUCT
CATALOG
& DESIGN
GUIDE
PRODUCT
CATALOG
& DESIGN
GUIDE
PRODUCT
CATALOG
& DESIGN
GUIDE
PRODUCT
CATALOG
& DESIGN
GUIDE
PRODUCT
CATALOG
& DESIGN
GUIDE
PulseGuard
®
ESD Suppressors
PRODUCT
CATALOG
& DESIGN
GUIDE
Gas Discharge Tube
(GDT) Products
PRODUCT
CATALOG
& DESIGN
GUIDE
Positive Temperature Coeffi cient
(PTC) Thermistor Products
Littelfuse offers technologies that protect electronic and electrical circuits and their users against electrostatic discharge (ESD),
load switching surges, lightning strike effects, overloads, short circuits, power faults, ground faults and other threats.
Overcurrent Protection Products:
Fuses
Littelfuse offers the world’s broadest range of fuse types and ratings, including
cartridge, leaded, surface mount and thin film designs
PTCs Positive Temperature Coefficient thermistor technology provides
resettable current-limiting protection
Protection Relays Electronic and microprocessor-based protection relays minimize
damage to equipment and personnel caused by electrical faults
Overvoltage Protection Products:
Varistors
Littelfuse offers surface mount Multi-Layer Varistors (MLVs) and
industrial Metal Oxide Varistors (MOVs) to protect against transients
GDTs Gas Discharge Tubes (GDTs) to dissipate transient voltage through
a contained plasma gas
Thyristors Solid state switches that control the flow of current in
a wide range of appliances, tools and equipment
SIDACtor® Devices Overvoltage protection specifically designed for legacy telecom
and today’s broadband connections
TVS Diodes Silicon Transient Voltage Suppression (TVS) devices
SPA™ Silicon Protection Arrays designed for analog and digital signal line protection
PulseGuard® ESD Suppressors Small, fast-acting Electrostatic Discharge (ESD) suppressors
Special Application Products:
PLED LED Protectors
LED string reliability devices that offer open LED bypass, ESD protection and
reverse connection protection
Download catalogs at www.littelfuse.com/catalogs or contact your authorized Littelfuse product representative for more information.