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zener diode values

Discussion in 'General Technical Questions and Answers' started by W6KLD, May 12, 2005.

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  1. W6KLD

    W6KLD Ham Member QRZ Page

    Thanks in advance for a reply!
    Will I get a close/similar amount of performance/protection if I swap a 1N4743a diode for a burnt 1N4751a that I burnt with mis-matched swr?
    Thanks !!
  2. W9GB

    W9GB Ham Member QRZ Page

    Mike -

    1N4743A is 13.0 V - 1 watt zener.
    1N4751A is 30.0 V - 1 watt zener

    And why not the correct substitute?

    Here is a nice zener diode referrence table

  3. W6KLD

    W6KLD Ham Member QRZ Page

    Thanks again!

    I did not realize the values were as seperated!
  4. W9GB

    W9GB Ham Member QRZ Page

    Mike -

    The numbering for zener diodes (as you can see in the Logwell supplied table) is not always sequential (values skipped) that you would expect.

  5. W5MJL

    W5MJL Ham Member QRZ Page

    I would think not, but I am a helium extra lite.  One is rated for 13volts and the other 30volts.  I'll bump this up and see if someone can answer this for you.
  6. K9STH

    K9STH Ham Member QRZ Page


    PLEASE change your font color to the "normal" black. It is almost impossible to read your text.

    Glen, K9STH
    One of the moderators
  7. W6KLD

    W6KLD Ham Member QRZ Page

    Thanks All!
    The reason for the switch was simple availability! I live a bit backwoods and wished to get a kit built on the air after I fried it! The electronics mail orders take a bit unless you ship 10$ overnight! I have a spare 1n4743a around and as this circuit is primarily for rf feedback protection, I could live with say a 23 - 26 volt value! 13 volt just won't cut it! I'd be replacing zeners all weekend!!
    Thanks for the great value chart!
  8. K8ERV

    K8ERV QRZ Member QRZ Page

    I might be able to help if I could read your message.

    TOM K8ERV Montrose Colo
  9. WA4ILH

    WA4ILH Subscriber QRZ Page

    I can read his text, ... if I take off my glasses and squint at the screen just right. Blue on white is rough for us old timers! Tom WA4ILH
  10. W9GB

    W9GB Ham Member QRZ Page

    Mike -

    Woodstock backwoods?  .. and that close to Atlanta?
    I wish I was that close to a major metropolitan area when I was a Novice (100 miles to Klaus Radio & 220 miles to Chicago).

    Georgia Tech EE department K9STH's alma mater - I think uses this supplier for electronic parts.
    They have almost everything you will likely every need (zeners, capacitors, resistors) for parts!  
    Yes,  Mr. Ack was an amateur radio operator in the Birmingham, AL area

    ACK Electronics

    Call today and post office should have to you by Saturday at the latest (if not Friday) !
    Mapquest tells me they are 25 miles and it would take 30 minutes (wow)

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