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Semitec® CRDs - Current Regulating Diodes

ATC Semitec’s range of Current Regulating Diodes (CRDs) or Current Limiting Diodes (CLDs) from Semitec are a very simple way of providing constant current over a wide voltage range.

They offer protection, stability and control when driving LED, optocoupler & battery-charging circuits

With a wide range of voltage values from 1V up to 100V our CRDs can steady a current at a fixed value. With SEMITEC’s CRDs voltage changes, load resistance changes and ripple voltage effects don’t change the fixed current value. Normally, creating a current stabilising circuit such as this could be complicated and would require complicated parts. With SEMITEC CRDs you only need one simple part for the same result.

This offers the advantage of simplifying product assembly and minimise component count particularly in space critical applications and of course cost.


  • LED brightness stabilisation
  • LED street lights, LED light bulbs, LED downlighters
  • Constant voltage circuit for supplying constant current to Zener diodes
  • Constant current source for proximity sensors and other sensors
  • Battery charge/ discharge circuits

Call us today on 01606 871680 to discuss your application’s thermal sensor requirements.  Using our extensive technical knowledge and innovative supplier base, we will work with you to provide the optimum solution for your product.


  • Semitec Current Regulating Diode, Constant Current, CLDs, Cicuit Protection
    Semitec CRD Range

    These are available as either surface mount SOD323 or Do-35 diode packages

    The S-series surface-mount range offers constant current values from 0.1mA to 22mA.

    Operating temperature range  -40° to 150°C

    Semitec CRDs operate over a wide voltage range and by combining them in parallel or in series with a zener, even higher current and voltage ratings can be achieved.