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zener vs PN diode

Discussion in 'General Electronics Chat' started by bhavesh03, Aug 14, 2010.

  1. bhavesh03

    bhavesh03 New Member

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    why a zener diode is transparent while a pn diode black/dark coloured?
     
  2. picbits

    picbits Well-Known Member

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    I have zener diodes that are dark/black (18V 5W) and pn diodes that are clear (1N4148)

    It seems the lower current diodes tend to be made in glass packaging while higher current are made from plastic or ceramic packaging.
     
  3. KMoffett

    KMoffett Well-Known Member

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    Application can also dictate body material. Diodes can be light sensitive. Black, epoxy bodies would not allow light exposure.

    Ken
     

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