ITA18B3| Datasheet

ITA18B3, ITA18B3RL, ITA25B3, ITA25B3RL, ITA6V5B3, ITAxxB3

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ITAxxB3
Bidirectional TransilTM array for data line protection
Features

High surge capability Transil array: IPP = 40 A (8/20 us) Peak pulse power: 300 W (8/20 us) Separated Input - Output Up to 9 bidirectional Transil functions Low clamping factor (VCL/VBR) at high current level Low leakage current ESD protection up to 15 kV
SO-20

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
GND INPUT INPUT 1 2 3 20 GND 19 OUTPUT 18 OUTPUT 17 OUTPUT 16 OUTPUT 15 OUTPUT 14 OUTPUT 13 OUTPUT 12 OUTPUT 11 GND

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

INPUT 4 INPUT INPUT INPUT INPUT INPUT
TM: Transil is a trademark of STMicroelectronics

5 6 7 8 9

GND 10

November 2007

Rev 2

1/8
www.st.com 8