Fake or Real 2SA1943

john65b · 11th November 2007, 04:22 PM

Hello all,

Just purchased a few 2SA1943 2SC5200 and cracked a 1943 open to verify its authenticity..

They are attached - any opinions?

john65b · 11th November 2007, 04:23 PM

One more...

Nordic · 11th November 2007, 05:10 PM

Seems large enough, I'd be more worried about the 5200

john65b · 11th November 2007, 05:35 PM

I guess i could crack one open...die should look the same size if real?

taj · 11th November 2007, 08:20 PM

Yeah, die size looks fine.

I was surprised to see that Digikey has stock of over 4000 pieces of real Toshiba parts, both polarities. I thought they were no longer being made, but the accompanying datasheet is dated Nov. 2006. That seems like a safe purchase.

Nordic, I LOVE that avatar.

I crack up every time I see it.

..Todd

Original Burnedfingers · 11th November 2007, 08:43 PM

Quote:

I was surprised to see that Digikey has stock of over 4000 pieces of real Toshiba parts, both polarities.

Be very carefull... I purchased some Toshiba transistors only to find that they weren't the real thing.

Mouser seems to be a better bet when buying transistors.

Nordic · 11th November 2007, 08:59 PM

I am going to try some 1943/5200 from ICS tommorrow... wonder if there will be sonic diffirence...

linuxguru · 12th November 2007, 05:33 AM

Authentic Toshiba 2sc5200/2sa1943 are current production and widely available. There are a lot of fakes also, and in many cases the fakes are more expensive than the real ones. It's the 2sc3281/2sa1302 which haven't been produced for years and are almost all fake. The counterfeiters prefer to fake the latter pair, because there's no competition now from the real thing.

The pics at the beginning of the thread show authentic devices, IMHO.

taj · 12th November 2007, 07:03 AM

Quote:

Originally posted by burnedfingers

Be very carefull... I purchased some Toshiba transistors only to find that they weren't the real thing.

Mouser seems to be a better bet when buying transistors.

Are you saying Digikey carries fake Toshiba parts??

..TJ

Stefanoo · 12th November 2007, 07:59 AM

Not true.

Had experience...just yesterday with this devices.
I had a 3 sets of 1943/5200 and everytime i would try to softly start up the output stage of my amp it would blow.
finally i decided to purchase this devices form another source.

i wanto to say right away that with this devices i did not have any problem.
Also, i want to outline that the bad devices measured with my tester (fluke 115) on diode position proved to be allright.

Differences on the outside:

as the first pic posted here the bad devices had the writes barely visible whilest the other one had a clear write.
I don't know if the guy here has the same problem the only thing is to try them up to their SOA limit and see if they can handle it.

One last thing: from the picture, thought, the silicon area seems to be big enough.

11th November 2007, 05:35 PM	#4
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	I guess i could crack one open...die should look the same size if real? __________________ "I speak Spanish to God, Italian to Women, French to Men, and German to my Horse" - Charles V

12th November 2007, 07:59 AM	#10
Stefanoo diyAudio Member Join Date: Apr 2006 Location: italia - ora USA -WI	Not true. Had experience...just yesterday with this devices. I had a 3 sets of 1943/5200 and everytime i would try to softly start up the output stage of my amp it would blow. finally i decided to purchase this devices form another source. i wanto to say right away that with this devices i did not have any problem. Also, i want to outline that the bad devices measured with my tester (fluke 115) on diode position proved to be allright. Differences on the outside: as the first pic posted here the bad devices had the writes barely visible whilest the other one had a clear write. I don't know if the guy here has the same problem the only thing is to try them up to their SOA limit and see if they can handle it. One last thing: from the picture, thought, the silicon area seems to be big enough. __________________ Stefano

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11th November 2007, 05:10 PM	#3
Nordic diyAudio Member Join Date: Sep 2005	Seems large enough, I'd be more worried about the 5200

11th November 2007, 08:20 PM	#5
taj diyAudio Member Join Date: Feb 2005	Yeah, die size looks fine. I was surprised to see that Digikey has stock of over 4000 pieces of real Toshiba parts, both polarities. I thought they were no longer being made, but the accompanying datasheet is dated Nov. 2006. That seems like a safe purchase. Nordic, I LOVE that avatar. I crack up every time I see it. ..Todd

11th November 2007, 08:59 PM	#7
Nordic diyAudio Member Join Date: Sep 2005	I am going to try some 1943/5200 from ICS tommorrow... wonder if there will be sonic diffirence...

12th November 2007, 05:33 AM	#8
linuxguru diyAudio Member Join Date: Sep 2007	Authentic Toshiba 2sc5200/2sa1943 are current production and widely available. There are a lot of fakes also, and in many cases the fakes are more expensive than the real ones. It's the 2sc3281/2sa1302 which haven't been produced for years and are almost all fake. The counterfeiters prefer to fake the latter pair, because there's no competition now from the real thing. The pics at the beginning of the thread show authentic devices, IMHO.

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