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参数资料
| 型号： | SRDA3.3-4-LF |
| 厂商： | PROTEK DEVICES |
| 元件分类： | TVS二极管 - 瞬态电压抑制 |
| 英文描述： | 500 W, UNIDIRECTIONAL, SILICON, TVS DIODE |
| 封装： | ROHS COMPLIANT, SO-8 |
| 文件页数： | 4/5页 |
| 文件大小： | 83K |
| 代理商： | SRDA3.3-4-LF |
4
05208.R3 12/07
www.protekdevices.com
SRDA3.3-4
APPLICATION NOTE
The SRDA3.3-4 is a low capacitance, unidirectional TVS array that is designed to protect I/O or high speed data lines from the damaging effects of
ESD or EFT. This product has a surge capability of 500 Watts P
PP per line for an 8/20s waveshape and offers ESD protection > 40kV.
DIFFERENTIAL-MODE CONFIGURATION (Figure 1)
Ideal for use in USB applications, the SRDA3.3-4 provides up to four
(4) lines of protection in a differential-mode configuration as depicted
in Figure 1.
Circuit connectivity is as follows:
Pins 1, 4, 6 and 7 are connected to the data lines.
Pins 5 and 8 are connected to ground.
Pins 2 and 3 are connected to the databus.
DIFFERENTIAL-MODE CONFIGURATION (Figure 2)
The SRDA3.3-4 also provides up to four (4) lines of protection in a
differential-mode configuration as depicted in Figure 2 for T1/E1
applications.
Circuit connectivity is as follows:
Pins 1, 4, 6 and 7 are connected to the data lines.
Pins 5 and 8 are connected to ground.
Pins 2 and 3 are connected to the databus.
CIRCUIT BOARD LAYOUT RECOMMENDATIONS
Circuit board layout is critical for Electromagnetic Compat-
ibility (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 induc-
tance.
Ground planes should be used whenever possible.
For multilayer PCBs, use ground vias.
Figure 2. Typical Differential-Mode T1/E1 Protection
4
1
2
8
7
6
5
3
PTC
PLC01-
6
PLC01-
6
GND
TRING
TTIP
RTIP
RRING
T1/E1
TRANSCEIVER
4
1
2
8
7
6
5
3
Figure 1. Typical Differential-Mode USB Protection
USB PORT
V
BUS
GND
D+
D-
USB PORT
V
BUS
GND
D+
D-
USB
CONTROLLER
V
BUS
GND
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