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Diode colour coding

Discussion in 'Electronic Components' started by Mark Aitchison, Feb 23, 2007.

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  1. I sometimes see (through-hole) diodes with colour coded bars instead of
    type numbers printed on; there obviously aren't enough lines to give a
    full part number (and I'm not sure if I have 812 or 218 anyway). I
    guess several different types of diodes (perhaps in different cases/made
    by different companies) might have the same colours because of the
    limited space for lines. How do I find out the part number of such
    diodes? Is there a website??

    Mark A
  2. I think that on any colour-coded diodes I have seen, the colour bands
    give the numeric part of the diode number. For example, a 1N914 would
    be marked white, brown, yellow (914).

    Peter Bennett, VE7CEI Vancouver BC, Canada
    peterbb4 (at)
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  3. As to my experience the "most significant bar/ring" is wider than the
    other bars/rings. E.g. a (1N)4448 diode would be marked as follows:
    yellow (wide) / yellow (small) / yellow (small) / grey (small). At the
    same time the wide bar/ring marks the cathode pin.


  4. Lionel

    Lionel Guest

    Read the stripes the same way you'd read resistors, then stick '1N' on
    the front. For example, yellow, brown, yellow, grey (4148) is a
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