socay.com

Transient Voltage Suppressors Array for ESD Protection
Low Capacitance
SLVU2.8-4
Description
SO-08
The SLVU2.8-4 is in an SO-08 package and may be used to
protect two high-speed line pairs. The “flow-thru” design
minimizes trace inductance and reduces voltage overshoot
associated with ESD events. The low clamping voltage of the
SLVU2.8-4 minimizes the stress on the protected IC.
Feature
Functional Diagram
u
400 Watts Peak Pulse Power per Line (tp=8/20μs)
u
Protects two line pairs (four lines)
u
Low capacitance
u
RoHS Compliant
u
IEC61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
u
IEC61000-4-4 (EFT) 40A (5/50ηs)
u
IEC61000-4-5 (Lightning) 24A (8/20μs)
Applications
u
10/100/1000 Ethernet
u
WAN/LAN Equipment
u
Test & Measurement Equipment
u
Switching Systems
u
Instrumentation
u
Audio/Video Inputs
Mechanical Characteristics
u
JEDEC SO-08 Package
u
Molding Compound Flammability Rating : UL 94V-0
u
Weight 70 Milligrams (Approximate)
u
Quantity Per Reel : 500pcs
u
Reel Size : 7 inch
u
Lead Finish : Lead Free
Mechanical Characteristics
Symbol
Parameter
Value
Units
400
W
PPP
Peak Pulse Power (tp=8/20μs waveform)
TL
Lead Soldering Temperature
260 (10sec)
ºC
TSTG
Storage Temperature Range
-55 to +150
ºC
Operating Temperature Range
-55 to +150
ºC
TJ
Air Discharge
±15
Contact Discharge
±8
IEC61000-4-2 (ESD)
IEC61000-4-4 (EFT)
40
A
IEC61000-4-5 ( Lightning )
24
A
SOCAY Electronics Co., Ltd.
Revision January 06, 2014
KV
www.socay.com
1/4
@ SOCAY Electronics Co., Ltd. 2014
Specifications are subject to change without notice.
Please refer to www.socay.com for current information.
Transient Voltage Suppressors Array for ESD Protection
Low Capacitance
SLVU2.8-4
Electrical Characteristics (@ 25℃ Unless Otherwise Specified )
Part Number
Device
Marking
VRWM
(V)
(Max.)
VB
(V)
(Min.)
IT
(mA)
VC
@5A
(Max.)
(Max.)
SLVU
2.8-4
2.8
3.0
1
8.5
20
SLVU2.8-4
(@A)
IR
(μA)
(Max.)
C
(pF)
(Typ.)
24
5
2
VC
Characteristic Curves
Fig1.
8/20μs Pulse Waveform
Fig2. ESD Pulse Waveform (according to IEC 61000-4-2)
tr
100
Peak Value IPP
80
100%
TEST
WAVEFORM
PARAMETERS
tr=8μs
td=20μs
Percent of Peak Pulse Current %
IPP - Peak Pulse Current - % of IPP
120
60
40
td=t IPP/2
20
0
0
5
10
15
20
25
90%
10%
tr = 0.7~1ns
30ns
30
60ns
t - Time (μs)
Fig3.
Time (ns)
Fig4. Insertion Loss S21
Non - Repetitive Peak Pulse Power vs. Pulse Time
Peak Pulse Power - PPK (kW)
10
1
0.1
0.01
0.1
1
10
100
1000
Pulse Duration - tp (μs)
SOCAY Electronics Co., Ltd.
Revision January 06, 2014
www.socay.com
2/4
@ SOCAY Electronics Co., Ltd. 2014
Specifications are subject to change without notice.
Please refer to www.socay.com for current information.
Transient Voltage Suppressors Array for ESD Protection
Low Capacitance
SLVU2.8-4
SO-08 Package Outline & Dimensions
Millimeters
Inches
DIM
Min
Max
Min
Max
A
4.80
5.00
0.189
0.197
B
3.80
4.00
0.150
0.157
C
1.35
1.75
0.053
0.069
D
0.35
0.51
0.013
0.020
G
1.27BSC
0.050BSC
H
0.10
0.25
0.004
0.010
J
0.19
0.25
0.007
0.010
K
0.40
1.27
0.016
0.050
M
0°
8°
0°
8°
N
0.25
0.50
0.010
0.020
S
5.80
6.20
0.228
0.244
Soldering Footprint
SOCAY Electronics Co., Ltd.
Revision January 06, 2014
www.socay.com
3/4
@ SOCAY Electronics Co., Ltd. 2014
Specifications are subject to change without notice.
Please refer to www.socay.com for current information.
Transient Voltage Suppressors Array for ESD Protection
Low Capacitance
SLVU2.8-4
Applications Note
Electronic equipment is susceptible to damage caused by Electrostatic Discharge (ESD), Electrical Fast Transients (EFT), and
tertiary lightning effects. Knowing that equipment can be damaged, the SLVU2.8-4 was designed to provide the level of protection
required to safe guard sensitive equipment. This product can be used in different configurations to provide a level of protection to
meet unidirectional line requirements as well as bidirectional requirements either in a common-mode or differential-mode
configuration.
Figure 1. Unidirectional Common-Mode Protection
Unidirectional Common-Mode Configuration (Figure 1)
The SLVU2.8-4 provides up to four lines of protection in a
common-mode configuration as depicted in figure 1.
Circuit connectivity is as follows:
- Line 1 is connected to Pin 1
- Line 2 is connected to Pin 7
- Line 3 is connected to Pin 3
- Line 4 is connected to Pin 5
- Pins 2, 4, 7 and 8 are connected to ground
Bidirectional Common-Mode Configuration (Figure2)
The SLVU2.8-4 provides up to two lines of protection in a
common-mode configuration as depicted in figure 2.
Circuit connectivity is as follows:
- Line 1 is connected to Pins 1 & 8
- Line 2 is connected to Pins 4 & 5
- Pins 2, 3, 6, and 7 are connected to ground
External diode to ground is a low capacitance
diode of less than 10pF
Figure 2. Bidirectional Common-Mode Protection
Bidirectional Differential-Mode Configuration (Figure3)
The SLVU2.8-4 provides up to two-line pairs of protection in
a differential - mode configuration as depicted in figure 3.
Circuit connectivity is as follows:
- Line Pair 1 is connected to Pins 1 & 2
- Line Pair 1 is connected to Pins 7 & 8
- Line Pair 2 is connected to Pins 3 & 4
- Line Pair 2 is connected to Pins 5 & 6
Circuit Board Layout Recommendations
Circuit board layout is critical for Electromagnetic
Compatibility (EMC) protection. The following guidelines
are recommended:
- The protection device should be placed near the input
terminals or connectors, the device will divert the
transient current immediately before it can be coupled
into the nearby traces.
- The path length between the TVS device and the
protected line should be minimized.
- All conductive loops including power and ground loops
should be minimized.
- The transient current return path to ground should be kept
as short as possible to reduce parasitic inductance.
- Ground planes should be used whenever possible. For
multilayer PCBs, use ground vias.
Figure 3. Bidirectional Differential-Mode Protection
SOCAY Electronics Co., Ltd.
Revision January 06, 2014
www.socay.com
4/4
@ SOCAY Electronics Co., Ltd. 2014
Specifications are subject to change without notice.
Please refer to www.socay.com for current information.