AN588 APPLICATION NOTE

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matter what the voltage is.

The objective is to meet the protection standards concerning industrial disturbances applied to data trans-

mission lines, which require to withstand the same level of energy no matter the application. This is re-

flected in the standard IEC801-5.

The choice and use of the ITAxx

All of the ITAxxx monolithic arrays have been developed with the same basic concept of the integration of

uni-directional functions, for uni-directional as well as bi-directional products (see Annex 1: Product Range

- Configurations).

The uni-directional products (ITAxxU series) are achieved with a network of common-anode Transil

which is similar to the discrete solution lay-out.

The bi-directional devices (ITAxxB series) are created with a network of common-cathode Transil which

require special attention for their usage.

Figure 4 below explains the functional schematic diagram obtained with a bi-directional Transil array

(ITAxxB series).

Figure 4. The use of a Bi-Directional Transil Array (ITAxxB series)

Basic Principle: Connect two Transil to ground (T01 and T02).

This precaution doubles the current capability in relation to ground, thus allowing to support the maximum

cause when a disturbance occurs, it spreads out over all the wires.

Device

8/20µsec

8/20µsec

8/20µsec

ITA6V1U3

ITA6V1M3

ITA18B1

ITA25B3

6V1

6V1

18

25

40A

40A

40A

40A

10V at 10A

12V at 10A

25V at 10A

31V at 10A

12V at 25A

14V at 25A

28V at 25A

36V at 25A

IN

OUT

Ligne n

Ligne 1

Ligne 2

Tn

T02

IN

IN

OUT

OUT

T1

T01

T2

Line n

T1

Tn

T2

Line 2

T02

T01

Line 1

Wiring Principle.

Equivalent Function.