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Zener Diode

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A Zener diode is a type of diode that permits current to flow in the forward direction like a normal diode, but also in the reverse direction if the voltage is larger than the rated breakdown voltage known as "Zener knee voltage" or "Zener voltage". A conventional solid-state diode will not let significant current flow if reverse-biased below its reverse breakdown voltage.
By exceeding the reverse bias breakdown voltage, a conventional diode is subject to high current flow due to avalanche breakdown. Unless this current is limited by external circuitry, the diode will be permanently damaged.
In case of large forward bias, the diode exhibits a voltage drop due to its junction built-in voltage and internal resistance. The amount of the voltage drop depends on the semiconductor material and the doping concentrations.


  • For use in stabilizing and clipping circuits with higher power rating
  • Low reverse current level
  • High stability and low noise

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