Data Brief

For further information contact your local STMicroelectronics sales office.

May 2008

Rev 1

1/4

4

STEVAL-IFP008V1

Demonstration board for the

CLT3-4B current limited termination

Features

operation

Description

The CLT3-4B is a quadruple logic input

termination for sensor or mechanical switch

interfaces. It is designed to work in 24 VDC

applications such as PLCs (programmable logic

controllers), PACs (programmable automation

controllers) and distributed I/O systems used in

factory automation.

The device optimizes the input VI characteristic to

reduce its power dissipation. This becomes

critical when the application cabinet or housing

requires higher protection levels such as IP65 and

IP67. These closed cabinets are used in various

automated lines including the food and chemical

industry.

The power dissipated inside the module is very

limited as there is usually no air circulation inside

the box. The current limitation also reduces the

power losses in the sensor.

The most important aspect of the CLT3-4B is the

electrical protection and susceptibility its brings to

the application. The CLT3-4B implements efficient

protection diodes on each input and supply volt-

age line. Serial resistors ensure a higher level of

susceptibility of the entire input module.

Thanks to its compact TSSOP20 package CLT3-

4B device occupies very little space on the PCB

compared to an equivalent discrete solution.

STEVAL-IFP008V1

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