replacing a mosfet irfp

[_Steven_]

dear friends,
For a good amplifier i need tot change some blown parts. It is a given piece of equipment.

I'm out of stock of the irfp140....can i change it with the irfp140A's? These seems to be an improved version of the -
A versions.


Is there anyone who had the same problem and can share it's opinion about the A type versions? There is a difference in output capacitance. And it is for audio equipment.

[_Steven_]

nobody?

[madires]

I'd download the datasheets for both and compare them.

[c4757p]

The output capacitance isn't going to matter, it's fine. The two are nearly identical.

[Ghydda]

As usual the N-version of the mosfet is a die shrink of the non-N version.
This is confirmed by looking at the gate charge numbers and the SOA-graph.

Depending on your application this could be a dealbreaker to go with the N-version.
Smaller die means lower pulse power handling capability (and pulse power dissipation is what you get a lot of in a normal class AB amp).

The A version looks like a die shrink as well (lower gate charge numbers) but the SOA-graph indicates it is a very good match to the original 140.

I would say this is a near spot on candidate.

As a sidenote Fairchild even characterized the SOA of this device at DC. Something IR never bothered to do with the original (one could suspect IR have something to hide there - pisspour performance @ DC maybe).

[_Steven_]

Thank You very much for the clear explanations!

[_Steven_]

So I can replace it with either the IRFP140A of 140N. I have them both. Beybe just one A version and the rest are N versions.

I will try it. Did'nt know anything about die shrink. thanx!