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Fqa12p20 Fqa19n20c Discontinuation
Fqa12p20 Fqa19n20c Discontinuation
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Old 22nd February 2012, 05:27 PM   #21
flg is offline flg  United States
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Quote:
Originally Posted by pchw View Post
I am almost done with matching 130 pairs of these. I measure each device at 1.5A and 0.5A and didn't find them behave very different from the IRF's. As the current goes up, so does the Vgs. I found them very stable once they reach stable operating temp. Can you describe what did you mean by drifting?

Thanks,
pchw, are those dedicated to the 25 F5 builders or will they be for sale??? Thanks
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Old 22nd February 2012, 05:28 PM   #22
pchw is offline pchw  United States
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I got a couple PM about selling these devices, matched. I would like to help my fellow hobbyist, but I don't have a large sample. Obviously, there are more than what I can use - can't imagine I will build more than 2 (not monster) amps.

Once I finish matching and put aside of my own reserve and 4 quads for another fellow member. I will let go the rest. Manuel, Buzzford, I got your PM, so you 2 will get the first dibs in the ordering of Manuel and Buzzford. **I have no intention to turn this into swap meet, so please email me via the forum if you are interested.**

If Michael wants to put his into the pool for matching, I am more than willing to do the matching for him and hopefully, there will be better yield and benefit more.

At present, my target is within 30mV, but I can tell you that real measurement are actually much better than that if I am only looking at a pair. However, it is a different ball game when I go to triples and quads.
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Old 22nd February 2012, 06:08 PM   #23
Tea-Bag is offline Tea-Bag  United States
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Fqa12p20 Fqa19n20c Discontinuation
I was measuring at 2A at 24V in free air for 2 minutes. The VGS does not stop going up.

Yes, the P-Channels seemed a bit more troublesome. the VGS being ~ 5v on them to.

Here are my measurements from the stuff aquired from Mike R.

FQA19N20C
3.7
3.71
3.73
3.73
3.73
3.73
3.74
3.74
3.74
3.74
3.74
3.74
3.74
3.74
3.74
3.75
3.75
3.75
3.75
3.75
3.75
3.76
3.76
3.77
3.78

FQA12P20
5.15
5.18
5.2
5.21
5.22
5.23
5.24
5.25
5.25
5.25
5.26
5.31
5.32
5.32
5.32
5.32
5.33
5.34
5.35
5.35
5.35
5.37
5.38
5.38
5.39

I was intending on ordering 600 or so of each, clearly to resell (this is NOT a commercial thread), and let them be sorted how they come out. Looking for the best methodology. Quads would be the top goal of getting so many.

Yes I want to build the V3 so I can drive my dang OB woofers.
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Old 22nd February 2012, 07:29 PM   #24
Malotron is offline Malotron  United States
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matching info: P - channels (1 shipment, Newark, years ago)

FQA12P20
3 5.15
3 5.16
8 5.17
3 5.18
13 5.19
4 5.20
11 5.21
8 5.22
7 5.23
6 5.24
3 5.25
3 5.26
9 5.27
3 5.28
4 5.29
3 5.30
2 5.31
1 5.32
2 5.33
3 5.35
1 5.39

-Mal
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Old 22nd February 2012, 08:14 PM   #25
CBS240 is offline CBS240  United States
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Hi

It seems the only real difference between those and these, FQP12P20 and FQP19N20C is that the FQP parts are TO-220 compared to TO-247. It appears they use the same die. If you directly mounted a copper or brass heat slug to the back of the device with a good thermal bond, increasing the surface area to the heatsink insulator, I bet it would closely compare in SOA to the TO-247 version. The max current of the TO-220 parts is only limited by maximum junction temperature. I have done this with other FQP's and surprised myself at how much power they can really handle. It seems many of the FQA's are being phased out but it doesn't mean the transistor is being discontinued. I suspect cost, and since the intended function is of a switch, in most cases TO-220 is sufficient. FQA47P06 is another example of discontinuing TO-247 packages, FQP47P06 is still produced, same die. Also the TO-220 is cheaper.
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Old 22nd February 2012, 11:16 PM   #26
pchw is offline pchw  United States
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Hi Teabag,

It will continues to go up in free air - thermal run away!! Mount the device to a heat sink, and it will stabilize. When I measure the devices, I let each of them run for 2-3 mins on a heat sink (a chunk of metal so to speak :-)). The Vgs usually settles within a min or so but will continue to change. The reading that I use is after the DMM stop changing or only toggling between 2 mv readings. It usually takes 5-10 mins for me to measure one fet as I don't sit there to watch, and my wife usually looks at me like the angry bird, LOL.

Hi flg,

I wish I could use these for F5X. The transistors for F5X are even harder to match, again the P's are just wild. In fact, all (a few hundred that I had my hands on) Toshiba P-channels (2SJ313, 2SJ618, 2SJ213) had very wide range. The N's are a lot tighter. The list from Mal and Michael pretty much confirm what I am seeing except I have a wider FQA12P20 range, doh!!
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Old 22nd February 2012, 11:40 PM   #27
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Fqa12p20 Fqa19n20c Discontinuation
Thanks Fred, I was wondering what the Master does, as sometimes he matches stuff without a heatsink. I will try your method and see if the variance is worth the extra time.
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Old 22nd February 2012, 11:53 PM   #28
pchw is offline pchw  United States
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No kidding, if you can find a suitable size of metal/heat sink and can stabilize the temp at something like 40C-50C, the measurement will be even more meaningful because the device is measured at close to real operating temp!!

Have fun!!
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Old 23rd February 2012, 01:03 PM   #29
h_a is offline h_a  Europe
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Quote:
I was measuring at 2A at 24V in free air for 2 minutes. The VGS does not stop going up.
I guess I only misunderstand something here??

You don't really heat the mosfet with 48 Watts without a heatsink for 2 minutes, right? In that case I would only wonder why the mosfet does not blow. Of course VGS will never stabilize.

I mean Nelson tested the LU-powerjfet without heatsink, but only for a second or two and not at these power levels.

www.passdiy.com/pdf/matching.pdf

Hannes
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Old 23rd February 2012, 01:29 PM   #30
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Fqa12p20 Fqa19n20c Discontinuation
Quote:
Originally Posted by h_a View Post
I guess I only misunderstand something here??

You don't really heat the mosfet with 48 Watts without a heatsink for 2 minutes, right? In that case I would only wonder why the mosfet does not blow. Of course VGS will never stabilize.

I mean Nelson tested the LU-powerjfet without heatsink, but only for a second or two and not at these power levels.

www.passdiy.com/pdf/matching.pdf

Hannes
I did here, they are warm at that point, not too hot. If I get a good stash I will put them some of my smaller 40W heatsinks that I use for SemiSouth's.
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