IRF520 vs IRF523

[carioux2008]

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?

 

[Robb]

You mean; other than being able to work @ 27mhz - or not?

Haven't a clue . . .

International Rectifier IRF-520 are cheap; you can find them from anywhere from a buck to $2/ea.
Mouser . . . et all . . .

http://www.mouser.com/ProductDetail...RF530PBF/?qs=sGAEpiMZZMvARmQSk64rFxVs518tZTmg

 

[nomadradio]

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.

73