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Old 25th March 2008, 11:53 PM   #171
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Quote:
Originally posted by MikeB


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
Ich have understood
I imagine that the logo corresponds to a firm
and that this firm publishes the datasheets...
That interests me is the correspondence to electric parameters
I am sure that the silicon works but I have buy this as MJ15015.

to soon
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Old 26th March 2008, 08:48 AM   #172
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Quote:
Originally posted by Gold_xyz
but i have buy this as MJ15015
Which it likely is, just not an original.
That yours is Chinese manufacture does not necessarily make it inferior, the slow mode 2n3055 and it's sturdier versions are produced by a whole bunch of semi companies.

Toshiba China likely manufactures semis like these, stuff that Toshiba Japan has no appetite for producing anymore.
The same applies to several higher grade semi numbers which Toshiba licensed to Korean facilities, manufactured there nowadays but not anymore in Japan.

Securing the die and connections with a dab of silicon does not immediately label it a fake, merely a different manufacturing approach.
Had it been labelled a 15003 or a 15024, then it would have been a counterfeit device.
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Old 27th March 2008, 01:25 AM   #173
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Quote:
Originally posted by jacco vermeulen

Which it likely is, just not an original.
That yours is Chinese manufacture does not necessarily make it inferior, the slow mode 2n3055 and it's sturdier versions are produced by a whole bunch of semi companies.
If I buy a MJ15015 I expect me that the parameters are:
Vceo = 120V Ic=15A Pd=180W hFE=around 40 Ft=around 1MHz as the original Type.
Have You verified this ?
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Old 30th March 2008, 11:20 PM   #174
eyoung is offline eyoung  United States
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hello fellow intrepid transistor purchasers, Has any on had the experience or gotten wind of fake Toshiba 2sk1530/sj201 on ebay??? There are several purveyors of these parts, and i was wondering how likely they are to be fakes??

regards, Elwood
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Old 21st April 2008, 06:41 PM   #175
weissi is offline weissi  Europe
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This is an ISC transistor. I bought some 2n3055 and MJ2955, also isc's.. They don't seem to be very bad at all.... Look, the die of the no-name 3055 is even bigger than the original Motorola one...
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Old 23rd April 2008, 05:39 PM   #176
weissi is offline weissi  Europe
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This is another one from ISC (Inchange Semiconductor):

This company seems to produce at least useable parts, of course, photos can't tell you the dynamical characteristics. But they do not save in silicon
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Old 3rd August 2008, 03:13 PM   #177
djQUAN is offline djQUAN  Philippines
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not a transistor but also a semiconductor.....

I have already installed it on the PCB and then I noticed it looked funny so I took it out to take pictures so it hasn't seen power.

if you ask me, the one on the right screams "FAKE!!!". the tab is only 0.5mm thick!!!

what do you guys think?


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Old 3rd August 2008, 03:26 PM   #178
AndrewT is online now AndrewT  Scotland
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send it to ONsemi telling them where you bought it.
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Old 6th August 2008, 11:04 AM   #179
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Default !

Does anybody know who is manufacture of this transistors?

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Old 6th August 2008, 09:02 PM   #180
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The S looks like Spectek, but i'm not sure if that company makes small semi's.

The other option is Signetics, aka Philips.
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