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Old 18th March 2006, 02:15 PM   #1
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Join Date: Jul 2005
Location: NJ
Default Genuine Toshiba 2SD424

Hi All,

I have a lot of 2SD424 transistors available. I believe these to be genuine Toshiba for the following reasons:

1. The baseplate is within thickness specs on the datasheet. All of the fakes I have seen thus far have baseplates that are entirely too thick.

2. The heat spreader imprint, which you can usually see from the bottom, is an hourglass shape, identical to the known genuine originals I have seen. The counterfeits often have a (way too small) circular indent on the bottom.

3. The spacing between the leads and the case are pretty small, again consistent with the known originals I have. Another point of difference seen on most counterfeits is that their lead-case spacing is a bit larger.

4. I have used some from this lot to fix an Adcom 555 which I have run at 66 watts for 10 minutes as well as blasted music through incessantly (into 8ohm loads). No issues.

I have measured hfe on a Tektronix 371A and will provide a plot showing a set of curves, as well as the datasheet. The hfe runs from about 71 to 88 at 2A, VCE:5V.

$7 each.

If there's any other test you'd like me to do, let me know.

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Old 19th March 2006, 08:24 AM   #2
mobyd is offline mobyd  New Zealand
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Location: Auckland
Interesting - I have a metric buttload of Toshy 2SB554s - the complement to your puppies. There must be an opportunity for a mutually beneficial prisoner exchange here :-)
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Old 21st March 2006, 09:42 AM   #3
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I sent you an email, did you receive it?

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