More Uniwatt Transistor subs

Here is some info I got from Rodger Boots regarding transistors subs. I
was originally looking for some good G05 transistor substitutes, but I
suppose these would work well in other situations. :)

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Uniwatt transistor availability and cost getting you down?
Looking for better parts at lower cost??
Not scared off by the fact that pinout and heatsink mounting will be
different???

WELL I HAVE A DEAL FOR YOU!

But, seriously, here's what I did. I went to DigiKey, used their
transistor selection capabilities, sorted the results by PRICE, and
tried to find inexpensive replacements.

First, the NPN transistor:

        MPS-U01, MPS-U05, MPS-U06, & MPS-U07 can all be replaced with a
2SD1264
at a cost of $.89 each, DigiKey part number is 2SD1264A-ND. Buy 10 for
$7.42 or 100 for $59.33. (Too expensive? All except the MPS-U06 &
MPS-U07 could be replaced with the 2SD2374 at $.77 each/ 10 for $6.45/
100 for $51.59).

But, you say, what about PNP transistors?

        MPS-U51, MPS-U55, MPS-U56, & MPS-U57 can all be replaced with a
2SB940
at a cost of $.97 each, DigiKey part number is 2SB940A-ND. Buy 10 for
$8.06 or 100 for $64.49. (Too expensive? All except the MPS-U56 &
MPS-U57 could be replaced with the 2SB1548 at $.85 each/ 10 for $7.09/
100 for $56.75).

Of course, as always, I could be completely full of it, but they look
like they should work. And, of course, I have no way to test this
myself. They handle over twice the power and way more current, but the
pinout is different (so careful lead bending will have to happen to
install them) and the old heatsinks might not fit. If the old heatsink
have a mounting hole they should be able to be screwed to the new parts.

Part of what I was trying to do was to keep it under $1 per part. As
good a criteria as any. Somewhere I have several hundred TO-220 heat
sinks, maybe a package deal could be made? (Uniwatt transistor used a
modified TO-202 case with a thin extended tab that sticks out of the
case. The transistor style of choice these days is the TO-220 which has
a thick metal tab that is the entire back of the case. This allows the
transistor to handle way more power and run cooler than the TO-202).

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tm
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Received on Wed Jul 24 08:02:51 2002