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IRF520 vs IRF523

Discussion in 'CB Radio Modifications' started by carioux2008, Mar 22, 2017.

  1. carioux2008

    carioux2008 New Member

    Sep 14, 2016
    Likes Received:
    A coworker of mine has a Cobra 29LX with the IRF520 MOSFET modification. Well, it seems to have stopped working and I was wondering if I could use the IRF523 mosfet in its place (and retune of course). The biggest difference I see is that the breakdown voltage is lower (80v vs 100v) and the drain current is slightly lower. I woudl suspect that the drain current will lower the overall output of the radio, but honestly, i dont really care about that. just want to get him running again.

    What effects will the 523 have over the 520 thats in there already?

  2. Robb

    Robb Yup

    Dec 18, 2008
    Likes Received:
    #2 Robb, Mar 22, 2017
    Last edited: Mar 22, 2017
  3. nomadradio

    nomadradio Analog Retentive

    Apr 3, 2005
    Likes Received:
    The IRF520,521,522 and 523 all share the same Fairchild data sheet. Couldn't find the original one from International Rectifier. Only difference I can see is with the voltage and current rating. 520 is listed as 100 Volts and 8 Amps. The 523 shows 60 Volts and 7 Amps. Don't think that will be important in a 12-Volt radio.

    The all-important switching speed doesn't appear to be different, so I'd guess that it will work. Just don't know how to predict how well it will work.


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