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Old 31st March 2011, 03:26 PM   #1
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Default ON-SEMI njw3281-njw1302

Hello..is there anybody who knows where can l find this devices?? and if they can be matched.....l was serching the internet and the only supplier l fond is a chinese ebayer.....
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Old 31st March 2011, 03:52 PM   #2
jaycee is offline jaycee  United Kingdom
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Newark, Digikey, Mouser.
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Old 31st March 2011, 04:07 PM   #3
lineup is offline lineup  Sweden
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... and Farnell
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Old 31st March 2011, 04:16 PM   #4
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Thank you...the problem is that to match the pairs you need to buy a lot of devices..Farnell is the only supplier here in Europe and it is very expensive.
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Old 31st March 2011, 05:00 PM   #5
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There is a very close equivalent to the NJW's( SOA, Hfe, package, Vce) It is the
2sc3263 / 2sa1294 by Sanken electric.

http://www.sanken-ele.co.jp/en/prod/...f/2sc3263e.pdf

http://www.sanken-ele.co.jp/en/prod/...f/2sa1294e.pdf

So close the amp can't tell (no Vbe re-adjustment)

PS - I get the NJW's for 2$usd apiece / 25 quan. You could have someone in the US order them and USPS to europe for $14usd flat rate.
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Old 31st March 2011, 05:09 PM   #6
lineup is offline lineup  Sweden
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2SC3263 is twice the price of NJW3281
3.40 vs. 1.76 at Farnell

1.76 for NJW3281 is not very expensive. I think
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Old 31st March 2011, 05:12 PM   #7
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That's is because they are already much closer matched , both between P/N and as a group (better part - specifically made for audio OP stages).

NJW3281 ??? NJW0281 / NJW0302 are what I get , I see the 3281/1302 as a datasheet ... they are the same thing ??
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Old 31st March 2011, 06:16 PM   #8
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So Sanken produce series very close one to another and no need any pairing?
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Old 31st March 2011, 06:35 PM   #9
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Sankens are 1-2 hfe difference P-N the 12 I have are also 1-2 Hfe as a group.

NJW's are also close 90+ for PNP 95+ for NPN. Whether you have to match them depends on your Re (emitter resistors). .22R is tolerant of 5+ beta mismatch .47R can do 10 beta mismatch to get below 1mv Re difference between devices.
I buy 25 each of P/N , group them by 4 or 8 P/N channel , making sure each "sex" is within 2-3 beta in the group. My finished amp reads
(P -17/17/16/17mv) and (N-17/18/17/17mv)... good enough for me.


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Old 31st March 2011, 08:48 PM   #10
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Well, speaking of which, I need to warn you people again regarding counterfeits on ebay. Here are some pics of fake MJL3281/MJL1302 I recently bought from a ebay seller from Hong Kong. Don't ask me why do I bother with ebay cuz it's something I can't explain . The worst part is that almost all transistors have a collector-emitter breakdown voltage around 195-200 Volts. I said almost cuz one had around 88V ! Then I decided to hammer this one and look....surprise! Am I shocked? No. That's the price when you mess around with unreliable ebay sellers. I'm still thinking about reporting this guy to ebay. Maybe he's also a victim of counterfeits? Well, that's all folks. Btw, here is also a pic of MJL3281 sample directly from ON Semi. The difference is obvious.

Fakes:

Click the image to open in full size.

Click the image to open in full size.

Genuine:

Click the image to open in full size.
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