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My Transistors, original or copy?
My Transistors, original or copy?
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Old 4th March 2008, 09:04 AM   #161
MikeB is offline MikeB  Germany
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Quote:
Originally posted by IsakAlexander
They are fakes... cracked one open, white gue inside.
You can't tell without having a reference. Maybe Matsushita build them with glue/white plastic. But the die size is suspect. It is quite small for a 150w device.

Mike
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Old 4th March 2008, 10:11 AM   #162
IsakAlexander is offline IsakAlexander  United Kingdom
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The letter S is missing and the M symbol is slightly different from the originals i got. Also the series/batch number doesnt seem right.
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Old 4th March 2008, 10:27 AM   #163
Nordic is offline Nordic  South Africa
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Break open an old one and compare?
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Old 4th March 2008, 10:37 AM   #164
IsakAlexander is offline IsakAlexander  United Kingdom
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Only got 2 working 2SB1163 left, don`t want to crack`em open.
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Old 5th March 2008, 11:06 PM   #165
wg_ski is offline wg_ski  United States
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Default How much profit could there be

in counterfeiting six-cent MPSA56's? It better be a lot, because I spent the last three moths chasing phantom oscillations that were caused by bad MPSA56's. They were marked

CE
MPS
A56

and every single one measures "weird" and causes the amp to act strange. It was just being used as the current limiter on the VAS - literally any good transistor would have worked. Hfe about 400 with a VBE around a quarter of a volt (but they do work as a PNP transistor).
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Old 6th March 2008, 06:28 AM   #166
Mooly is offline Mooly  United Kingdom
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My Transistors, original or copy?
See post 128 of this thread.
Regards Karl
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Old 6th March 2008, 04:00 PM   #167
linuxguru is offline linuxguru  India
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I have fake Toshiba 2sc3423s with laser-etched Toshiba logos, in a package which turns out to be inaccurate(isolated TO-126ML instead of 2-8H1A) - they turned out to be PNP devices with hFE ~= 360. Are they wrongly-marked 2sa1360s, or a small-signal dies like bf423/mpsa92/bc558 packaged into isolated TO-126 packages? Probably the latter, maybe even the same die as the fake MPSA56 above.

I'll try to break one open in due course and take a look.
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Old 25th March 2008, 11:14 AM   #168
Gold_xyz is offline Gold_xyz  Italy
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Hi,
2N3773 "Toshiba"
I had fortunately only one of it
http://www.diyaudio.com/forums/showt...32#post1465732

But I have a Lot of These...
everything makes me suspect that it is a fake.
which factory does it have this logo ?
Click the image to open in full size.

Now I do remove the Glue....
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Old 25th March 2008, 06:48 PM   #169
Gold_xyz is offline Gold_xyz  Italy
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this makes me believe that it is a fake:
- absence of copper pad
- chip of the same sketch of the "red label" Toshiba

Also for remove the withe silicon :
- 24 hours of soak in (premium) gasoline to soften the glue
- steel brush to remove residues
- washing and cleaning with toothpaste
(the only disadvantage is that they detach him the threads)

Click the image to open in full size.

Fake or True ?
every suggestion is very appreciated...

bye
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Old 25th March 2008, 07:03 PM   #170
MikeB is offline MikeB  Germany
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Quote:
Originally posted by Gold_xyz
Fake or True ?
Neither!

As it does not claim to be an original OnSemi/Motorola it can't be fake. But it is also not an original, just manufactured by someone else.
It is obviously not the quality of an original, but not necessarily useless.
I don't remember the logo, but being a real manufacturer, he will not produce useless parts.
I believe you can use these parts.

Mike
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