Zener diodes are used for voltage regulation, as a Voltage Regulator or Stabilizer, as a Meter Protector and as a Wave Shaper. They can be found wide applications commercially and industrially. The load voltage equals breakdown voltage VZ of the diode. The series resistor limits the current through the diode and drops the excess voltage when the diode is conducting.
The common type Glass Case Silicon Planar Zener Diodes are used below:
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