Toshiba 2SC3281/2SA1302 - Are these fakes? - Page 2 - diyAudio
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Old 7th August 2002, 04:19 AM   #11
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I've bought 100's of these, and they didn't all look exactly the same. Some black and green, some all black; but all in Toshiba packages. All had letters for the beta range.

The early Motorola versions were re-branded Toshibas, as Motorola had trouble getting the yield up on theirs. No guarantee they ever got it together.

Jocko
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Old 7th August 2002, 06:42 AM   #12
bawang is offline bawang  Malaysia
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The green one looked like the fakes that I bought. Look at the back. Mine has voids (holes) between the metal part and the epoxy casing. How do I know it's a fake (my batch)? It blew!
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Old 7th August 2002, 08:05 AM   #13
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Default O and R

On Toshiba' datasheet it reads:

HFE: O=80-160 and R=55-110

Also the mounting hole must be about 3,3 [mm]

There is a page on the subject on

http://sound.westhost.com/counterfeit.htm

\Jens
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Old 7th August 2002, 03:30 PM   #14
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Default On-Semi version

The current On-Semi production of these types is fine; they even work quite well in non loop feedback circuits- not just my own, this is what Ayre Acoustics uses in their V-5 and V-6.

Regards,

Jon
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Old 9th August 2002, 07:26 AM   #15
yugaaa is offline yugaaa  India
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you can use motorola devices.only thing is that to operate linearly you have to add a couple of output devices.application note published by them does that
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Old 12th August 2002, 07:22 AM   #16
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Do you know the number of the app note or have a link? I didn't find anything at OnSemi.

Eric
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Old 12th August 2002, 07:35 AM   #17
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OnSemi's named them MJL3281A/MJL1302A, as opposed to the Toshiba equivalents (2SC/2SA). They have a shared spec doc:

http://www.onsemi.com/pub/Collateral/MJL3281A-D.PDF

You can also order samples from them-- up to ten of each, so long as you don't give them a free email address (hotmail, yahoo, etc). I had to change my profile.. I hope they don't sell my info.

Anyway, they also have spice models 'n stuff. Good resource.
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Old 12th August 2002, 07:53 AM   #18
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I know about the data sheet, I was referring to the app note that yugaaa mentioned.

Eric
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Old 12th August 2002, 08:44 AM   #19
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Oh, I apologize. This is all the info OnSemi has, I think:
http://www.onsemi.com/productSummary...L1302A,00.html
http://www.onsemi.com/productSummary...L3281A,00.html

Motorola also has their own site for semiconductor app docs (not sure if it has the BJTs, though):
http://e-www.motorola.com/
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Old 5th January 2007, 02:23 PM   #20
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In Thailand we find lots of fakes of the popular SANKEN Audio power transistors. They blow up quickly as is clear from the following:
Maybe these Toshiba's are fakes too.

Too find out with the SANKEN's I measured the Cob and Cib. The fakes have much smaller chips and consequently show half the input- and output capacitances.
Just compare the capacitances of the a real one with a suspected fake one with a handheld capacitance meter and find out quickly!

Hidde
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