November 2007 Rev 2 1/8
8
ITAxxB3
Bidirectional Transil™ array for data line protection
Features
■ High surge capability Transil array:
I
PP
= 40 A (8/20 µs)
■ Peak pulse power: 300 W (8/20 µs)
■ Separated Input - Output
■ Up to 9 bidirectional Transil functions
■ Low clamping factor (V
CL
/V
BR
) at high current
level
■ Low leakage current
■ ESD protection up to 15 kV
Complies with the following standards
■ IEC 61000-4-2 level 4
– 15 kV (air discharge)
– 8 kV (contact discharge)
■ MIL STD 883G- Method 3015-7: class 3B
– 25 kV (human body model)
Applications
Differential data transmission lines protection,
such as :
■ RS-232
■ RS-423
■ RS-422
■ RS-485
TM: Transil is a trademark of STMicroelectronics
Description
Transil diode arrays provide high overvoltage
protection by clamping action. Their
instantaneous response to transient overvoltages
makes them particularly suited to protect voltage
sensitive devices such as MOS technology and
low voltage supplied IC’s.
The ITA series combines high surge capability
against energetic pulses with high voltage
performance against ESD.
The separated input/output configuration of the
device ensures improved protection against very
fast transient overvoltage like ESD by elimination
of the spikes induced by parasitic inductances
created by external wiring.
Figure 1. Functional diagram
SO-20
1
2
3
4
8
7
6
5
20
19
18
17
16
15
14
13
12
11
9
10
GND GND
GND GND
INPUT OUTPUT
INPUT OUTPUT
INPUT OUTPUT
INPUT OUTPUT
INPUT OUTPUT
INPUT OUTPUT
INPUT OUTPUT
INPUT OUTPUT
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