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Motorola zener diode

Discussion in 'General Electronics Discussion' started by James260265, Apr 1, 2021.

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  1. James260265

    James260265

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    Apr 1, 2021
    got a diode in a fried Iskra CDI from an old hirth engine, marked up, Mk (Motorola logo) 79 c4v9 415
    has anyone got any clues as to an equivalent?

    pretty sure the 79 c4v9 is the material type but 415?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Looks like a 4.9 V zener, not a vey common value. Could you upload cleat pictures of the diode (< 300kB/picture)?
     
  3. James260265

    James260265

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    Apr 1, 2021
     
  4. James260265

    James260265

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    Apr 1, 2021
    Pictures taken to show all markings on circumference. Mk (Motorola logo) 79 c4v9 415 20210401_102108.jpg 20210401_102108.jpg 20210401_102020.jpg 20210401_101546.jpg 20210401_101342.jpg
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    I read this as C4V7, not V9, a much more plausible value: 4.7 V, 0.5 W. Datasheet is here.
     
  6. James260265

    James260265

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    Apr 1, 2021
     
  7. James260265

    James260265

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    Apr 1, 2021
    you are correct D'oh! So what exactly am I looking for? There are so many variants of the 4.7v, 0.5w zener diodes
     
    Last edited: Apr 1, 2021
  8. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    I linked the datasheet in post #5.
     
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