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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 23rd April 2012, 12:21 PM   #101
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Samples sould arrive today or tommorrow. I will have transfer curve comparison between 19n20C and 16n25C. If these are close, I wouldnt expect any real signifiant deviation anywhere else considering how close the two datasheets match.
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Old 24th April 2012, 03:38 AM   #102
flg is offline flg  United States
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buzzforb, I've done quite a bit of MOSFET testing in the past few years. I can at lest help you out witht the theory. I've probably done all the other tests though. Most were RdsON, Idsmax, SOA curve data, performance in switching applications, etc. Swithching stuff is not what we want but I understand all this raz ma taz pretty well...
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Old 24th April 2012, 08:34 AM   #103
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Thanks FLG. I appreciate the offer. I have the fets, but waiting on some test bed components. I should have some numbers in next couple of days.
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Old 9th May 2012, 01:02 AM   #104
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Default Transfer curves

Here is the basic comparison.

Measured across .1R 1% source resistor
Attached Files
File Type: doc FQA comparison.doc (46.0 KB, 83 views)
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Old 9th May 2012, 01:40 AM   #105
Rush is offline Rush  United States
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Quote:
Originally Posted by buzzforb View Post
Here is the basic comparison.

Measured across .1R 1% source resistor
They look pretty close, offset a bit, I guess you ideally want them to overlay each other or at least overlay the p channel?
Can you adjust something to get them to overlay, or are you pointing out that they are too different?

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Old 9th May 2012, 03:41 AM   #106
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This would suggest that they are very similar.
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Old 17th June 2012, 01:20 AM   #107
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Little update. Almosr done with N channel. Matching is good. P Channel not as good, but OK. I have acces to more and may have to get them to ensure matches, but all looks good. I wouls day that shipment within 4-6 weeks is likely. Thanks.
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Old 17th June 2012, 02:21 AM   #108
palmito is offline palmito  United States
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Buzzforb, are you using locky_z's curve tracer to do the matching? Thanks.
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Old 17th June 2012, 02:37 AM   #109
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Began with traditional methods. Didnt start using curve tracer until after i verifed its performance against fets matched using traditional methods. Results are very repeatable using both methods. For curve tracer matching, i test them, sort them by Vgs and then retest again before final sort.
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