Possible fake Toshiba/Sanken transistors?

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#22
kimbo said:
The only way to be really sure is to sacrifice one and break it open......check out the size of the silicon die. If it is really small then it is a fake. Ouch!!
Click to expand...

after reading this URL:
http_sound.westhost.com/fake/counterfeit-p2.htm
I got the following idea: Checking of internal die size through the use of infrared camera (choised temperature at flansh: arround 50 degrees without heatsink)
What I need is an adjustable current source, a original BjT device and one of the supposed original/fake for comparing the infrared pictures so as an infrared camera.
Unfortunately I haven't such a thing, but perhaps one of the other members.

sander entia non sunt multiplicanda praeter necessitatem (???)

Latin idioms I don't know. Unfortunately I'm also not a philosoph.
 
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#24
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UPDATE - 03/11/2009 - 2SC5200/2SA1943 confirmed genuine.
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Alright, received my genuine 2SC5200/2SA1943 transistors from Profusion today, have to say they do a great job in packing these up and sending them out on short notice, nothing short of excellent.

So I was finally able to cross compare with a larger batch of transistors, I have 25-pcs of the suspected fake 2SC5200/2SA1943 (25 of each) and 30-pcs of genuine 2SC5200/2SA1943 (30 of each), hence I checked all for max Ic (kept that at 80%) and all passed with flying colors, as they did for hFe and for capacitances between pins.

Hence the 2SC5200/2SA1943 transistors I bought are genuine.

Cheers,

Sander.
 
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#27
Hi guys
can some one please tell me if these are original Toshiba transistors or not :
thank you..🙂
 

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#32
djQUAN said:
What's the difference between the TT vs 2S devices? I didn't see anything after a quick scan of the datasheet.
Click to expand...
This version is also from Toshiba:
http://www.rlocman.ru/i/File/dat/Toshiba/Transistors_Bipolar_BJT_Single/TTC5200.pdf
Ask by Toshiba about
http://www.semicon.toshiba.co.jp/eng/contact/index.html
what means "2S" and "TT" (perhaps "Toshiba Triplet difused")
check out also this sites:
http://www.semicon.toshiba.co.jp/eng/product_detail/transistor/bipolar/1254093_13589.html
and
http://www.semicon.toshiba.co.jp/eng/product_detail/transistor/bipolar/1253921_13589.html
 
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#35
Stormsonic,
2SC5200/2SA1943 are classified in to two hfe groups R (hfe 55-110) and O( hfe (80-160).But TTC5200/TTA1943 have no hfe classification and thus character indicator is not printed on packing . Hfe varies from 80 to 160.

regards
Joshvi
 
#39
2SC5200 & 2SA1943

Regarding the 2SC5200 & 2SA1943
To be honest the transistors in the image look real however it is hard to know. I have been looking into these transistors of late and there are lots of fakes available on the likes of eBay and Alibaba. In my experience on the fake devices the underscore line below the batch code covers all three marking where on the real devices it only covers 2 markings.

Also the JAPAN marking is a little more scrunched together on the fakes. (Note this will always change on the fakes as the counterfeiters are very crafty )

The fakes have iron inside them and a magnet sticks quite strongly to them where as the Toshiba devices are made out of a solid copper construction. (Iron? Yes Iron it's cheaper than copper however it is a much poorer coductor of heat)

I have also seen fakes with nearly the correct size silicone dies however; they still do not work properly especially under load and they are unreliable.

This is a genuine Toshiba device from Mouser 🙂

An externally hosted image should be here but it was not working when we last tested it.




This one is a fake from some clown on eBay UK claiming to be genuine parts😛
An externally hosted image should be here but it was not working when we last tested it.


One other thing the fake 2SC5200 and 2SA1943 have the same batch numbers. I am not sure about Toshiba batch numbers however on the real ones I have only ever seen them with at least one digit difference and never the same. I hope this is of help.. Regards John
 
#40
toshiba 2sc5200 mosfet

anyone know why my toshiba 2SC5200 running mosfet,i check this transistor using multitester set to resistor test,the result its like running K or IRF transistor?...i got other 2SC5200 running NPN(B,C,E) this transistor is good...Its there any diffrent between this 2SC5200 and my other 2SC5200 or maybe diffrent pinout but same code(2SC5200)...? :headbash::headbash:
 
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