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Stefanoo 26th April 2010 02:13 PM

IRFP9240 Fairchild where to buy it?
Hi Everybody,

I am designing my power amp and I was thinking on using IRFP240 and IRFP9240 because they have nice specs, and they are really robust and have a nice strong SOA.
The only problem is that, unfortunately, as many of you already know, the 9240's by IRF is not so linear.
Therefore I am looking for the 9240 by Fairchild.

Is there any advice on where to find this part at a good price point?
I've been looking but without too much luck till now.
I will keep reasearching in the meantime, hoping to find something.

Thank you for your attention.

Nelson Pass 26th April 2010 05:11 PM

You want the FQ series, such as the FQA12P20.


Stefanoo 26th April 2010 05:22 PM

thank you Mr. Pass.

Stefanoo 26th April 2010 05:27 PM

Do you use the IRF for the N-ch and Fairchild only for the P or both Fairchild is better for you?


HaflerFreak 26th April 2010 05:38 PM

I probably shouldn't do this, I was gonna buy them myself, but there are exactly 88 brand-new FQA12P20 devices available at Newark. There would be 100, but I got a dozen last month. The FQA19N20C is unobtanium anywhere.

I do think I have read that it is OK to use IRFP240/FQA12P20 together, that is what I was planning to do - anyone have objections??

Stefanoo 26th April 2010 05:44 PM

Have you look close enough? I am sure you can find the unobtainable part ;)

But my question than is:

is the FQA19N20C better than the IRFP240?

Either way having two different cases for the devices on the output stage wouldn't look too attractive to me :)

HaflerFreak 26th April 2010 05:49 PM

I have looked at eBay, Digi-key, Mouser, and Newark. The only availability I found at all was on this board - and too pricey for me at the moment.
I got 2 9240's from Mouser and 12 FQA12P20's from Newark.

At the moment, I gotta be happy with what I have, no more parts money for awhile.... :(

HaflerFreak 26th April 2010 05:52 PM


Either way having two different cases for the devices on the output stage wouldn't look too attractive to me
Ya, I thought of that too, but the things we do for love (of low distortion)!

I would like a definitive answer to this question myself as I have no FQA N devices, but could finish my amp with 240/12P20 combos or 240/9240.

Nelson Pass 27th April 2010 05:13 PM


Originally Posted by Stefanoo (
is the FQA19N20C better than the IRFP240?

No indication of serious differences. I recall that the Fairchild
part has higher temperature coefficient on Vgs.


samoloko 28th April 2010 08:36 AM

here you can buy from Poland ??????? ?????: irfp9240 // ???????? ? ?????? ?? ?????????? ????? - TME - Electronic Components

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