Selenium Diode


  • The characteristic of selenium diode is shown in the figure A. 
  • The forward break over voltage of this diode is very low but is has comparatively higher reverse breakdown voltage
  • This diode operates in the reverse biased condition. 
  • When over voltage appears across semiconductor, it operates.
  • As the selenium diode operates, the voltage across it remains constant but current increases sharply. There are two types of selenium diodes

       ( A ) Polarized
       ( B ) Non – polarized
  • The symbol of both types of selenium diodes are shown in the figure A.
  • The polarized type diode operates only in one direction whereas non – polarized diode operates in both directions.


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