LOW VOLTAGE UNIDIRECTIONAL
TVSarray ™
SCOTTSDALE DIVISION
SLVU2.8K – 4U
WWW.Microsemi .COM SLVU2.8K – 4U
DESCRIPTION APPEARANCE
The SLVU2.8K-4U provides 500 Watt protection with LOW CAPACITANCE, LOW
CLAMPING VOLTAGE and the LOWEST LEAKAGE in the industry for two lines to
ground (common mode). Low unidirectional capacitance of 10 pF for each line and low
standby current provides a more stable signal in higher frequency applications and at
lower operating voltages of 2.8 volts. Negative transients on each line are also clamped
to very low voltages with an anti-parallel forward diode in each leg (line to ground). The
SLVU2.8K-4U is designed for use in applications where protection is required at the
board level from voltage transients caused by electrostatic discharge (ESD) as defined in
IEC 61000-4-2, electrical fast transients (EFT) per IEC 61000-4-4 and effects of
secondary lightning. These arrays are used to protect two lines by connecting both pins 1
and 8 to line 1 and pins 4 and 5 to line 2. Pins 2 and 7 as well as pins 3 and 6 are all
connected to ground as shown in Figures 3, 4 and 5.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
FEATURES APPLICATIONS / BENEFITS
Protects 2 unidirectional lines to ground with very low
clamping voltage including opposite (negative)
transients on each line with a forward biased diode
Provides electrically-isolated protection
Low operating voltage: 2.8 volts
Low capacitance of 10 pF
Low standby current
Low clamping voltage with minimal voltage overshoot
EIA-RS232 data rate: 19.6 kbs
EIA-RS422 data rate: 10 Mbs
EIA-RS423 data rate: 100 kbs
10 / 100 Ethernet
WAN / LAN Equipment
Lowest standby (leakage) current in the industry
Very low parasitic inductance resulting in minimal
voltage overshoot (Ldi/dt) effects
Negative transients minimized that could damage
CMOS transceivers
MAXIMUM RATINGS MECHANICAL AND PACKAGING
Operating Temperature: -55°C to +150°C
Storage Temperature: -55°C to +150°C
Peak Pulse Power: 500 watts
(8/20 µs, Figure 1 and Figure 2)
Molded SO-8 Surface Mount
UL 94V-0 Flammability Classification
Weight 0.066 grams (approximate)
Marking: Logo, device marking code, date code
Pin #1 defined by dot on top of package
Tape & Reel per EIA Standard 481-1-A
13 inch reel; 2,500 pieces (STANDARD)
Carrier tubes; 95 pcs (OPTIONAL)
ELECTRICAL CHARACTERISTICS PER LINE @ 25°C Unless otherwise specified
STANDOFF
VOLTAGE
VWM
VOLTS
PUNCH-THRU
VOLTAGE
VPT
IPT = 2 µA
VOLTS
SNAP-BACK
VOLTAGE
VSB
ISB = 50 mA
VOLTS
STANDBY
CURRENT
ID
VWM = 2.8V
µA
CLAMPING
VOLTAGE
VC
IPP = 2 A
(Figure 2)
VOLTS
CLAMPING
VOLTAGE
VC
IPP = 5 A
(Figure 2)
VOLTS
CLAMPING
VOLTAGE
VC
IPP = 24 A
(Figure 2)
VOLTS
CAPACITANCE
(f=1 MHz) *
C
@ 0V
pF
PART
NUMBER
DEVICE
MARKING
CODE
MAX MIN MIN MAX MAX MAX MAX TYP
SLVU2.8K-4U 2.8K4U 2.8 3.0 2.8 0.1 5.5 8.5 15 10
* Capacitance line-to-ground is 10 pF typical (including anti-parallel diode for negative transients and low clamping voltage).
Note: Transient Voltage Suppressor (TVS) product is normally selected based on its stand off voltage VWM. Product selected
voltage should be equal to or greater than the continuous peak operating voltage of the circuit to be protected.
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
Copyright 2003
MSCXXXX.PDF 10-6-2003 REV 0
LOW VOLTAGE UNIDIRECTIONAL
TVSarray ™
SCOTTSDALE DIVISION
SLVU2.8K – 4U
WWW.Microsemi .COM SLVU2.8K – 4U
SYMBOLS & DEFINITIONS
Symbol DEFINITION
VWM Standoff Voltage: Maximum dc voltage that can be applied over the operating temperature range.
VWM must be selected to be equal or be greater than the operating voltage of the line to be protected.
VPT Punch-Thru Voltage: The minimum voltage the device will exhibit at a specified current
VSB Snap-Back Voltage: The minimum snap-back voltage the device will exhibit at a specified current
VC Clamping Voltage: Maximum clamping voltage across the TVS device when subjected to a given current at a
pulse time of 20 µs.
ID Standby Current: Current at VWM.
C Capacitance: Capacitance of the TVS as defined @ 0 volts at a frequency of 1 MHz and stated in picofarads.
GRAPHS
8/20
µ
s 500W Pulse
PPP – Peak Pulse Power (W)
Pulse Time t=µsec FIGURE 2
FIGURE 1 Pulse Wave Form
Peak Pulse Power vs. Pulse Time
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 2
Copyright 2003
MSCXXXX.PDF 10-6-2003 REV 0
LOW VOLTAGE UNIDIRECTIONAL
TVSarray ™
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 3
Copyright 2003
MSCXXXX.PDF 10-6-2003 REV 0
WWW.Microsemi .COM
SCOTTSDALE DIVISION
SLVU2.8K – 4U
SLVU2.8K – 4U
SCHEMATIC
FIGURE 4
FIGURE 3 Circuit Board Layout
Common Mode Configuration
FIGURE 5
Schematic
PACKAGE DIMENSIONS and PAD LAYOUT
PAD LAYOUT
INCHES MILLIMETERS
DIM MIN MAX MIN MAX
A 0.188 0.197 4.77 5.00
B 0.150 0.158 3.81 4.01
C .053 .069 1.35 1.75
D .011 .021 0.28 0.53
F .016 .050 0.41 1.27
G .050 BSC 1.27 BSC
J .006 .010 0.15 0.25
K .004 .008 0.10 0.20
L .189 .206 4.80 5.23
P .228 .244 5.79 6.19
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