K2955/J554 - fake? - diyAudio
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Old 13th February 2012, 09:42 AM   #1
ace99 is offline ace99  Yugoslavia
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Default K2955/J554 - fake?

Hello,

I bought 2SK2955 and 2SJ554 ( Hitachi ) transistors a few weeks ago. They looks different than original. Please look at the pictures, plastic cases are the same, olny different thing is mark on them. Probably the original one is SJ554, but I'm not sure maybe both are fakes? I have 1st time K2955/J554 on my hands.
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Old 13th February 2012, 10:39 AM   #2
EUVL is offline EUVL  Europe
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2SJ554/2SK2955 classAB SEPP power amplifier

往年のDCアンプパーツ(パワー・FET)
Midway down the page, with photos.

????????????????????(3) - ??????

Photo

http://image01.w.livedoor.jp/h/e/hea...c507b01589.jpg


Patrick
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Old 13th February 2012, 10:46 AM   #3
ace99 is offline ace99  Yugoslavia
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So, seems to be 100% fakes...
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Old 13th February 2012, 11:54 PM   #4
mmoraw is offline mmoraw  United Kingdom
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I ve got these from 3 sources, looks genuine to me
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Old 14th February 2012, 12:15 AM   #5
mmoraw is offline mmoraw  United Kingdom
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I've bought these from 3 sources, looks ok to me ...
these are not hitachi these has been made for renesas i think. (not 100% sure)
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Old 15th February 2012, 12:44 PM   #6
mmoraw is offline mmoraw  United Kingdom
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OK THESE ARE FAKES !
Contacted Renesas lastnight, used your photos and send over to the guys today.

I've got confirmation from engineer from Renesas and all can say is that these here are fakes for sure.

Be aware, surface has been sanded down, and new etching done, probably some other fets has been used or who knows what else.
Anyway do not recommend using those devices in any projects.

It is so frustrating that it is so difficult to buy original and genuine trans these days.
Seems that everything which is worth more than 1$ is worth being counterfeited for someone in the far east.

Best regards
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Old 15th February 2012, 01:33 PM   #7
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Auditors, can you move this to the correct thread ?
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