Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
Copyright
2001
MSCXXXX.PDF 7-30 2002 REV C
WWW.
Microsemi
.COM
SLVU2.8K-4
2 DIFFERENTIAL LINE PAIRS
SCOTTSDALE DIVISION
SLVU2.8K-4
DESCRIPTION
The SLVU2.8K-4 provides 500 Watt protection with LOW CAPACITANCE and
the LOWEST LEAKAGE in the industry for two lines in common mode or two
differential line pairs. Low bi-directional capacitance of 10 pF per line pair and
the LOW STANDBY CURRENT provides a more stable signal in higher
frequency applications and at lower operating voltages of 2.8 volts. The
SLVU2.8K-4 bidirectional array 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 differential line pairs in a bi-directional mode by
connecting both pins 1 and 8 to line 1 of pair one and pins 2 and 7 to line 2 of
pair one. For protecting a second pair, connect pins 3 and 6 to line 1 of pair
two, and pins 4 and 5 to line 2 of pair two as shown in Figures 4 and 4A. The
array can also be used for protecting two direct lines in the common mode by
connecting either side of the pair to ground and the other side to line as
shown in Figure 3.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
ELECTRICAL CHARACTERISTICS PER LINE @ 25°C Unless otherwise specified
STAND OFF
VOLTAGE
VWM
VOLTS
PUNCH-THRU
VOLTAGE
VPT
IPT = 2 µA
VOLTS
SNAP-BACK
VOLTAGE
VSB
ISB = 50 mA
VOLTS
STANDBY
(LEAKAGE)
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
MAX MIN MIN MAX MAX MAX MAX TYP
SLVU2.8K-4 2.8K-4 2.8 3.0 2.8 0.1 5.5 8.5 15 5
* Capacitance per line pair or line-to-ground is 10 pF typical for bi-directional protection.
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.
TVSarray™ SERIES
APPLICATIONS
• 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
FEATURES
• Protects 2 bidirectional lines or 2 differential line pairs
• Provides electrically-isolated protection
• Low operating voltage: 2.8 volts
• Low bidirectional capacitance: 10 pF
• Low clamping voltage of 5.5 volts at 2 amps
MAXIMUM RATINGS
• 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)
MECHANICAL
• 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
PACKAGING
• Tape & Reel per EIA Standard 481
• 13 inch reel; 2,500 pieces (STANDARD)
• Carrier tubes; 95 pcs (OPTIONAL)
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 2
Copyright
2001
MSCXXXX.PDF 7-30 2002 REV C
WWW.
Microsemi
.COM
SLVU2.8K-4
2 DIFFERENTIAL LINE PAIRS
SCOTTSDALE DIVISION
8/20µs 500W Pulse
Figure 1
Peak Pulse Power Vs Pulse Time t = µsec
SLVU2.8K-4
SYMBOLS & DEFINITIONS
Symbol DEFINITION
VWM Stand Off 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: Leakage current at VWM.
C Capacitance: Capacitance of the TVS as defined @ 0 volts at a frequency of 1 MHz and stated in picofarads.
GRAPHS
OUTLINE AND SCHEMATIC
INCHES MILLIMETERS
MAX
MIN
DIM MAX
MIN
0.197
A 0.188 4.77 5.00
0.158 0.150 3.81 4.01
0.069 0.053 1.35 1.75
0.021 0.011 0.28 0.53
0.050 0.016 0.41 1.27
0.050 BSC 1.27 BSC
0.010 0.006 0.15 0.25
0.008 0.004 0.10 0.20
0.206 0.189 4.80 5.23
B
C
D
F
G
J
K
L
0.244 P 0.228 5.79 6.19
Figure 2
Pulse Wave Form
Ppp Peak Pulse Power (W)
OUTLINE
PAD LAYOUT
SCHEMATIC
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 3
Copyright
2001
MSCXXXX.PDF 7-30 2002 REV C
WWW.
Microsemi
.COM
SLVU2.8K-4
2 DIFFERENTIAL LINE PAIRS
SCOTTSDALE DIVISION
SLVU2.8K-4
APPLICATION NOTES
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.
All electronic equipment are susceptible to damage generated by ESD, EFT and lightning interference. With
this in mind the SLUV2.8K-4 was designed to provide a level of component protection that meets
or exceeds
IEC standards 61000-4-2 and 61000-4-
4 plus moderate levels of induced lightning. This device can be used
for protecting two bidirectional lines in the common mode, or two line pairs in the differential mode. The
following description defines common and differential mode configurations.
Bidirectional two line common mode (Figure 3)
Two lines can be protected
in the bidrectional common mode by utilizing
the SLVU2.8K-4 product. Devices are connected in an anti-
parallel
configuration between line and ground. Pins 1 and 8 are connected to line
(or ground) while the pin pair 2 and 7 is connected to the ground (or
line).
Note that product can be connected in either configuration.
For protecting the second line in the bidirectional common mode Pins 4 and
5 are connected to line 2 (or ground) while the pin pair 3 and 6 are
connected to the ground (or line). Note tha
t product can be connected in
either configuration.
Bidirectional two line pair differential mode (Figure 4 and Figure 4A)
Two line pairs can be protected in the differential m
ode by utilizing the
SLVU2.8K-4 product. The device circuits are connected in an anti-
parallel
configuration between line 1 and line 2 of the Line Pair to be protected.
For protecting Line Pair #1, pins 1 and 8 are connected to line 2 and pin 2
and 7 are connected to line 1 of the line pair.
For protecting Line Pair #2 in the bidirectional-
differential mode, connect pins
4 and 5 to line 1 and pins 3 and 6 to line 2 of Line Pair #2
Figure 3
COMMON MODE CONFIGURATION
Figure 4
DIFFERENTIAL MODE CONFIGURATION
Figure 4A
DIFFERENTIAL MODE CONFIGURATION
CIRCUIT BOARD LAYOUT