High-speed digital-input current limiters for industrial automation

April 19, 2016 // By Graham Prophet
Industrial automation inrush current suppressors, STMicroelectronics
STMicroelectronics positions its latest high-speed digital-input current limiters as setting new standards for circuit protection in factory automation. The SCLT3-8BQ7 and CLT01-38SQ7 provide industrial Programmable Logic Controllers (PLCs) with fast, robust protection against input-signal current spikes while reducing power consumption, board space, and component costs.

The company says that according to market analysts it has the largest single share (~15%) of the transient voltage suppressor market, and cites its packaging technology as a differentiator. Both devices are housed in the QFN-48L (7 x 7mm) package with a large exposed thermal pad that optimises power dissipation at ambient temperatures greater than 100ºC.


Features include

* 8 high-speed SPI protected outputs;

* 8/16-bit high-speed SPI output;

* High-side inputs with common ground;

* Integrated 5V regulator;

* 30V+ reverse polarity protection;

* Energy-free LED output signal for visual status indication;

* 78 mW/channel power-dissipation capability;

* Temperature/voltage alarm options.


The high-speed inputs and outputs are fully compliant with the requirements of best-in-class PLCs.

The CLT01-38SQ7 also delivers robustness compliant with the most stringent international EMC (Electromagnetic Compatibility) standards such as IEC 61000-4.2, IEC61000-4.4, and IEC6100-4.5.


The SCLT3-8BQ7 and CLT01-38SQ7 are priced at $0.90 (1,000)-unit quantities. Evaluation boards are available for both the SCLT3-8BQ7 ( STEVAL-IFP030V1) and the CLT01-38SQ7 ( X-NUCLEO-PLC01A1).


ST Microelectronics; www.st.com/current-limiters-qfn48-nb