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View Poll Results: F5T 19n20C replacement
FQA19n20L 0 0%
FQA12n25C 10 83.33%
FQA32N20C 0 0%
FQA28N15 0 0%
FQP TO220 2 16.67%
Multiple Choice Poll. Voters: 12. You may not vote on this poll

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Old 9th April 2012, 04:36 PM   #11
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I am almost 100% sure that i have secured what i believe to be the best alternative to the 19n20C. I have one more lead on the original, but if it doesn't pan out, I would suggest FQA16n25C. I will provide links to both datasheets and I believe you will see that they are almost identical in performance.

FQA19n20c link from digikey
MOSFET N-CH 200V 21.8A TO-3P - FQA19N20C

FQA16n25c
MOSFET N-CH 250V 17.8A TO-3P - FQA16N25C

This should allow you to get datasheet direct from Digikey
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Old 9th April 2012, 04:38 PM   #12
oiphy is offline oiphy  Norway
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The system cannot find the path specified
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Old 9th April 2012, 05:31 PM   #13
flg is offline flg  United States
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Well, a fine spot we are in eyy? About now, I believe it is time to look back on some comments Charles Hansen made...
Attached Images
File Type: jpg Hansen on IRFP Problem.jpg (122.0 KB, 368 views)
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Old 9th April 2012, 05:58 PM   #14
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I remember reading this conversation. Fortunately, the P channel parts are not in question and the N channel substitute seem to match the original spec'd part extremely well. Better so than the standard 19n20 part that would be next in line in the 19n family.
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Old 9th April 2012, 06:25 PM   #15
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Here is a link with Nelson commenting on the original parts.

Fqa12p20 Fqa19n20c Discontinuation
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Old 10th April 2012, 02:18 PM   #16
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I can get FaArichild orginal FQA16n25C parts in sealed boxes. I have some samples on the way and will provide a comparison between it and the orginal 19n20c part. If all looks good, then i will put it into an F5T and try to get some distortion numbers to compare to the article. I also will try to contact all GB members and inform them of what is happening.
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Old 11th April 2012, 09:38 PM   #17
oiphy is offline oiphy  Norway
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so I checked out the datasheets and I agree with you buzzforb, seems that the 25c series is a good place to start. I applaud you for youre tremendus effort with this gb.
Thanks

Stig
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Old 11th April 2012, 09:50 PM   #18
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Thanks for all the work you've put into this. I'm behind whatever the group at large decides, so far it sounds like the 16N25C is the way to go.
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Old 11th April 2012, 10:15 PM   #19
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Hi buzzforb,
Also thanks for all the hard work and the substantial investment on your part!
I'll go with the part you decide.
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Old 11th April 2012, 10:29 PM   #20
flg is offline flg  United States
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Thanks buzzforb. I agree, the 16N25C is an excellent replacement for the 19N20C. I haven't had time to do the research on Charles Hansen's suggestion of basically selecting a higher voltage complement to get the Transcunductance down to match the P part. I use a 150V part sometimes that is 20S! I think we should look for 400V N parts?
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