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Old 26th April 2010, 02:13 PM   #1
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Default 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.
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Old 26th April 2010, 05:11 PM   #2
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You want the FQ series, such as the FQA12P20.

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Old 26th April 2010, 05:22 PM   #3
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thank you Mr. Pass.
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Old 26th April 2010, 05:27 PM   #4
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Do you use the IRF for the N-ch and Fairchild only for the P or both Fairchild is better for you?

thanks.
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Old 26th April 2010, 05:38 PM   #5
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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??
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Old 26th April 2010, 05:44 PM   #6
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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
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Old 26th April 2010, 05:49 PM   #7
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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....
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Old 26th April 2010, 05:52 PM   #8
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Quote:
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.
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Old 27th April 2010, 05:13 PM   #9
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Quote:
Originally Posted by Stefanoo View Post
is the FQA19N20C better than the IRFP240?
No indication of serious differences. I recall that the Fairchild
part has higher temperature coefficient on Vgs.

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Old 28th April 2010, 08:36 AM   #10
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here you can buy from Poland ??????? ?????: irfp9240 // ???????? ? ?????? ?? ?????????? ????? - TME - Electronic Components
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