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CLT03-1SC3 | CLT03-2Q3 - Single & Dual-line self-powered digital input current limiters in SOT23-8L and QFN-16L

CLT03-1SC3 single line self powered digital input current limiter
CLT03-2Q3 self powered digital input current limiter

The self-powered CLT03-1SC3 and CLT03-2Q3 digital input current limiters drastically reduce power dissipation while improving EMC robustness in industrial automation and process control.

In high-density compact multi-channel modules, power consumption and associated heat dissipation is a critical consideration. An efficient current limitation should be applied in compliance with IEC 61131-2 specifications.

The CLT03-1SC3 and CLT03-2Q3 are industrial digital input current limiters that convert a 24 V digital input to 3 mA current to drive optical isolators or non-isolated LVTTL interfaces.

With a wide input voltage range up to 60 V, a built-in test pulse generator, and extra smart power limitation during overvoltage, the CLT03-1SC3 and CLT03-2Q3 simplify SIL certification for safety applications.

Key features of CLT03-1SC3 and CLT03-2Q3

vibration sensor with 10 year longevity
  • Accurate current limitation for Type 1 and Type 3 IEC 61131-2 digital inputs
  • Self-powered, eliminating the need for an external field-side power supply
  • 60 V maximum input voltage
  • Able to interface high side or low side sensors (sinking or sourcing inputs)
  • Over-voltage protected with extra power dissipation reduction above nominal operating conditions

Key benefits of CLT03-1SC3 and CLT03-2Q3

  • Flexibility: No need for an external field-side power supply!
  • Single- and dual-channel versions
  • Compatible with high/low-side sensors, opto-couplers and CMOS output
  • Safety: 60V tolerant, embedded configurable test pulses, channel isolation, indicator LED on process side
  • Space saving compared to discrete implementation
  • Reduced BOM costs

Application examples

industrial automation Process control & Industrial automation
programmable logic controller Programmable Logic Controllers (PLC)
motor control Motor control
  • CNC controls
  • Remote input modules
  • Current sourcing inputs
  • ...

How to test & prototype with CLT03 Series

Choose a development kit to start testing the capabilities and features of CLT03-1SC3 and CLT03-2Q3:

Isolated and non-isolated digital inputs on evaluation board

STEVAL-IFP035V1

Isolated and non-isolated digital inputs on evaluation board based on CLT03-2Q3 self-powered current limited termination device.

PROTECT-FINDER

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Self-powered Digital Inputs with CLT03-2Q3

This presentation is presenting the CLT03-2Q3 and is summarizing the range of ST's self-powered digital input current limiters.

SELF-POWERED CURRENT LIMITERS - Design flexibility with single -and dual- line solutions

The CLT03 series of current limiters drastically reduces input losses while improving EMC robustness.

PDF current limiters self powered