Author Topic: replacing a mosfet irfp  (Read 2781 times)

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Offline _Steven_

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replacing a mosfet irfp
« on: June 08, 2013, 08:59:49 pm »
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.

« Last Edit: June 08, 2013, 09:08:08 pm by _Steven_ »
 

Offline _Steven_

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Re: replacing a mosfet irfp
« Reply #1 on: June 10, 2013, 06:17:41 pm »
nobody?
 

Online madires

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Re: replacing a mosfet irfp
« Reply #2 on: June 10, 2013, 06:22:31 pm »
I'd download the datasheets for both and compare them.
 

Offline c4757p

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Re: replacing a mosfet irfp
« Reply #3 on: June 10, 2013, 06:23:00 pm »
The output capacitance isn't going to matter, it's fine. The two are nearly identical.
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Offline Ghydda

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Re: replacing a mosfet irfp
« Reply #4 on: June 11, 2013, 07:45:53 am »
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).
If we learn from our mistakes then I reckon I'm getting a great education!
 

Offline _Steven_

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Re: replacing a mosfet irfp
« Reply #5 on: June 11, 2013, 03:11:24 pm »
Thank You very much for the clear explanations!
 

Offline _Steven_

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Re: replacing a mosfet irfp
« Reply #6 on: June 15, 2013, 10:27:42 am »
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!
 


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