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How to remanufacture your Blower powerstage yourself 850

I found this at Radio Shack:

IRF510 Power MOSFET Transistor
N-Channel 60V

Max Ratings:
V-dss 100V
Vgs +- 20V
Id 4A
dm 16A
Igm 1.5A
Pd 20W

I'm concerned that as compared to the original:

IRF510 Pd is 20W but the original lists two ratings:Pd is 2.5W but Pd(Tc=25C) 150W

Also

IRF510 Id is 4A and the original is Id 80A

Are these differences good, bad or indifferent? The IRF510 overall looks to be correct but I don't know this stuff and would like some clarification.

thanks,
Bryan






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