Series Zener Diodes

Discussion in 'General Electronics Chat' started by Joster, Aug 5, 2014.

  1. Joster

    Thread Starter Member

    Jun 12, 2013
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    Hi All,

    Are two 15V Zener diodes in series basically the same as a 30V zener???
     
  2. crutschow

    Expert

    Mar 14, 2008
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    The are the same except for a possible difference in their combined impedances at breakdown (the zener impedance). You have to look at the respective data sheets to see.
     
  3. to3metalcan

    Member

    Jul 20, 2014
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    The other way they're different is if the circuit also makes use of their .7V forward breakdown...obviously two diodes is going to give you two voltage drops instead of one!
     
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    So put a 1n914 or 1n400x in inverse parallel with the two series Zeners...:D
     
  5. to3metalcan

    Member

    Jul 20, 2014
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    Mike - heh, there may or may not be a few high-powered bass amps with exactly that arrangement lumped into them and doused in hot glue floating around the East Bay...
     
  6. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
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    Two (equal) zeners in series also have twice the dissipation as one.
     
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