ITAXXB3 查看數據表（PDF） - STMicroelectronics

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ITAXXB3

BIDIRECTIONAL TRANSIL™ ARRAY FOR DATALINE PROTECTION

STMicroelectronics 

ITAxxB3

This monolithic Transil Array is based on 610 unidirectional Transils with a common cathode and can be

configurated to offer up to 9 bidirectional functions. This imposes a maximum differential voltage between

2 input pins (see table 4).

Table 4: Application information

Types

ITA6V5B3

ITA18B3

ITA25B3

Maximum differential voltage between two input pins at 25°C

+ / - 3.5 v

+ / - 9.0 v

+ / - 12.5 v

Figure 8: RS-232 junction (typical application)

TX

RX

RTS

CTS

DTR

DSR

CARRIER DET.

AUX

GND

APPLICATION NOTICE

Design advantage of ITAxxxB3 used with 4-

point structure.

The ITAxxxB3 has been designed with a 4-point

structure (separated Input/output) in order to

efficiently protect against disturbances with very

high di/dt rates, such as ESD.

The purpose of this 4-point structure is to eliminate

the overvoltage introduced by the parasitic

inductances of the wiring (Ldi/dt).

Efficient protection depends not only on the

component itself, but also on the circuit layout.The

drawing given in figure shows the layout to be

used in order to take advantage of the 4-point

structure of the ITAxxxB3.

Figure 9: The4-point structure

Input 1

di/dt

GND

Chip

GND

Output 1

BE

U DEPVRICOETTEOCTED

4/7

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