Hello All,
I recently received some Toshiba 2SC3281 & 2SA1302 transistors from Parts Express. I'm concerned about these being fakes. I've attached an image of what I received. I was thrown off by the 2SA1302 being green in color.
Has anyone received authentic parts from Parts Express?
Thanks for your help,
-kec
I recently received some Toshiba 2SC3281 & 2SA1302 transistors from Parts Express. I'm concerned about these being fakes. I've attached an image of what I received. I was thrown off by the 2SA1302 being green in color.
Has anyone received authentic parts from Parts Express?
Thanks for your help,
-kec
Attachments
SA/Sc fakes?
I have the same colour devices as you have. They also look identical including the printing. I bought these in Singapore. I bought them several times from different shops and they all look the same. They also work fine. Your devices look just like mine and so should be OK. Besides Parts Express will not play games with customers.
I have the same colour devices as you have. They also look identical including the printing. I bought these in Singapore. I bought them several times from different shops and they all look the same. They also work fine. Your devices look just like mine and so should be OK. Besides Parts Express will not play games with customers.
Toshibas
kec,
I have bought these in the past from Dalbani in the US and have recieved both black and green ones, with no apparent difference in performance. I wouldn't worry. I mean, if you were on an assembly line making these transistors, wouldn't you want a change now and then, if only in the color?😉
Jan Didden
kec,
I have bought these in the past from Dalbani in the US and have recieved both black and green ones, with no apparent difference in performance. I wouldn't worry. I mean, if you were on an assembly line making these transistors, wouldn't you want a change now and then, if only in the color?😉
Jan Didden
Fakes ??
I beleave they are fakes, since the typing is not in line with the casing on the green one (The 2SA1302A was green on the older models). Also there must be either an O or an R to tell what range the HFE is this is missning on the 2SA3281A.
The housing must be about 20 * 25,5 [mm]
I beleave that Toshiba has now replaced them with 2SA1943 (PNP) and 2SC5200 (NPN)
So any transistors bought now are either old or fakes.
ONsemi has them under the name MJL3281A/1302A
\Jens
I beleave they are fakes, since the typing is not in line with the casing on the green one (The 2SA1302A was green on the older models). Also there must be either an O or an R to tell what range the HFE is this is missning on the 2SA3281A.
The housing must be about 20 * 25,5 [mm]
I beleave that Toshiba has now replaced them with 2SA1943 (PNP) and 2SC5200 (NPN)
So any transistors bought now are either old or fakes.
ONsemi has them under the name MJL3281A/1302A
\Jens
As far as I know, ON MJL3281/1302 are not as linear as Toshiba 2SC3281/2SA1302, and can cause more distortion in very high quality amps.
Regards, P.Lacombe
Regards, P.Lacombe
also green
Here is my pair that I bought from Mouser.com about 2 weeks ago.
Here is my pair that I bought from Mouser.com about 2 weeks ago.
An externally hosted image should be here but it was not working when we last tested it.
Thanks for the image Jean
It looks like the only difference on mine is I have 8K instead of 7J and I'm missing the 0 on the 2SC3281.
Jens, Are you sure there's supposed to be O or R ?
I posted this question to Parts Express and Jeff confirmed they
are indeed original Toshiba parts.
Thanks for the help,
-kec
It looks like the only difference on mine is I have 8K instead of 7J and I'm missing the 0 on the 2SC3281.
Jens, Are you sure there's supposed to be O or R ?
I posted this question to Parts Express and Jeff confirmed they
are indeed original Toshiba parts.
Thanks for the help,
-kec
Fake or not.
Kec,
I would think that you should try to measure out the hfe and the HV breakdown limit of the devices you have. Alternatively use it in a simple power amp and see if it works well. I have seen slightly different priniting on power devices before but never had a problem. Instead of worrying yourself ,just use it and see if it works fine.
Kec,
I would think that you should try to measure out the hfe and the HV breakdown limit of the devices you have. Alternatively use it in a simple power amp and see if it works well. I have seen slightly different priniting on power devices before but never had a problem. Instead of worrying yourself ,just use it and see if it works fine.
I believe that these could be original Toshiba parts BUT manufactured in China. This is the trend now with many manufacturing companies. The parts do work, but may not be upto the standard of original Japanese parts.
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
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
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!
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
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
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
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
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
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.
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.
Oh, I apologize. This is all the info OnSemi has, I think:
http://www.onsemi.com/productSummary/0,4317,MJL1302A,00.html
http://www.onsemi.com/productSummary/0,4317,MJL3281A,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/
http://www.onsemi.com/productSummary/0,4317,MJL1302A,00.html
http://www.onsemi.com/productSummary/0,4317,MJL3281A,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/
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
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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