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Homework Help: What is this diode symbol?

  1. Apr 22, 2010 #1


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    Gold Member

    1. The problem statement, all variables and given/known data
    I have looked in all my textbooks but i can't find anything about this diode or what it does?
    Here is the symbol of that diode (from a City & Guilds past exam paper):

    2. Relevant equations
    It's just an unknown diode symbol to me, and there are no equations that i know of associated with it.

    3. The attempt at a solution
    At first look, it appears to be a Zener diode, but it might not be, unless it's an old version of the Zener diode??
    Last edited by a moderator: Apr 25, 2017
  2. jcsd
  3. Apr 22, 2010 #2
    zener diode with (threshold??) voltage of 2V
    i.e. anything over 2v is aloud to pass back through
  4. Apr 22, 2010 #3


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    Staff: Mentor

    As Mardoxx says, it looks to be a variation of a Zener diode symbol:


    It's not commonly used, though, at least not in the US. Here, a Zener symbol generally has angled tips to the cathode line, with an angled tip on both sides. A Schottky diode generally has two right-angle tips to the Cathode line. So having a single right-angle tip on the cathode line is unusual.
    Last edited by a moderator: Apr 25, 2017
  5. Apr 22, 2010 #4


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    Gold Member

    Thank you both of you. Your help is much appreciated. :)
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