diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Solid State (http://www.diyaudio.com/forums/solid-state/)
-   -   Can you help me about 2sb649A/2sd669A (http://www.diyaudio.com/forums/solid-state/107235-can-you-help-me-about-2sb649a-2sd669a.html)

Zeljko 21st August 2007 05:31 AM

Can you help me about 2sb649A/2sd669A
 
2 Attachment(s)
Hi, please can you help me about those transistors, are they genuine Hitachi or they are fake?
Thanks!

Zeljko 21st August 2007 05:34 AM

2 Attachment(s)
And another one picture...

AndrewT 21st August 2007 09:54 AM

Hi,
is that little diamond in the middle the remnants of the chip?

smithy666 21st August 2007 11:03 AM

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.

Zeljko 21st August 2007 02:11 PM

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?

AndrewT 21st August 2007 05:31 PM

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.

Lumba Ogir 22nd August 2007 11:36 AM

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.

jackinnj 22nd August 2007 01:13 PM

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.

http://www.tech-diy.com/2sb649a_2sd66a.jpg

Lumba Ogir 22nd August 2007 01:42 PM

jackinnj,
right, these are definitely genuine!

jackinnj 22nd August 2007 02:20 PM

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.


All times are GMT. The time now is 08:39 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2