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CRDs - Constant Current Diodes

Semitec’s range of CRD Current Regulating Diodes (sometimes called current limiting diodes or constant current diodes) offer 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 would require numerous parts, using Semitec CRDs you only need one simple part to achieve 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, light bulbs and downlighters
  • Constant voltage/current circuits for Zener diodes
  • Constant current source for proximity sensors and other sensors
  • Battery charging/discharge circuits
  • DC-DC converters

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
    CRD Constant Current Diodes

    CRDs are current regulating diodes (or constant current diodes) that help to maintain a fixed current value over a wide voltage range.

    • Constant current values from 0.1mA to 22mA
    • Operating temperature range:  -40°C to 150°C
    • Can be used in parallel or in series with Zener diodes