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Old 21st August 2007, 05:31 AM   #1
Zeljko is offline Zeljko  Croatia
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Default Can you help me about 2sb649A/2sd669A

Hi, please can you help me about those transistors, are they genuine Hitachi or they are fake?
Thanks!
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Old 21st August 2007, 05:34 AM   #2
Zeljko is offline Zeljko  Croatia
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And another one picture...
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Old 21st August 2007, 09:54 AM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
is that little diamond in the middle the remnants of the chip?
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Old 21st August 2007, 11:03 AM   #4
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If these are supposed to be from the same manufacturer, then it seems a little strange that the logo is slightly different on each device. I would be suspicious but I don't know which one is correct.
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Old 21st August 2007, 02:11 PM   #5
Zeljko is offline Zeljko  Croatia
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Quote:
Originally posted by AndrewT
Hi,
is that little diamond in the middle the remnants of the chip?
Yes, if you look at black plastic part, you will see it.
BTW dont you think that it is so small for that kind of transistors or it is normal size?
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Old 21st August 2007, 05:31 PM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
they do a low power To92 version of this transistor with what appear to be identical characteristics.
If this is indeed a high power version, then we would expect the chip to be smaller than the norm, but that does strike me as very small.
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Old 22nd August 2007, 11:36 AM   #7
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Hi,
these are not carrying the characteristic etched marking method and shape of molded case always used, not genuine Hitachi...

Andrew,

Quote:
they do a low power To92 version
Who? The Caribbean pirates? The TO-92 package is simply inappropriate for this transistor and never announced or manufactured by Hitachi.
Its properties are specified, for different properties another designation is assigned.
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Old 22nd August 2007, 01:13 PM   #8
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These are from a lot I received several years ago -- they are in Hitachi boxes and Hitachi plastic bags -- these devices are not in the current Renesas (Hitachi) family.

Click the image to open in full size.
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Old 22nd August 2007, 01:42 PM   #9
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jackinnj,
right, these are definitely genuine!
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Old 22nd August 2007, 02:20 PM   #10
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well, i think that the Hitachi devices are going to be unobtanium after a while -- I have tested the PMC devices from Singapore and they match up pretty well -- but my testing hasn't been that extensive.
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