On Thu, 14 Apr 2011 19:41 -0400, "V G" wrote:
> I selected a MOSFET and BJT of which I'd like to keep a few in stock for
> high current applications.
>=20
> BJT: http://dipmicro.com/store/TIP41C
>=20
> MOSFET: http://dipmicro.com/store/STP16NF06
>=20
> I need a heat sink to go with them:
> http://dipmicro.com/store/index.php?act=3DviewCat&catId=3D486
>=20
> Which one should I get? Which one of those seems like it has the highest
> heat dissipation capability?

Heatsink ratings for two of them are shown, the best being 15.6 degrees
C rise per watt. So with ambient 25 C you boil water at 5 watts.
Personally I don't run semiconductors at 100 C.

You will need big heatsinks for what I recall you mentioning about 24
watts.

As has been said before, to-220 case parts are not really good for a
whole lot of heat, 20 watts being thrown around. I concur.

You can get a more if your surfaces are nice and you torque properly.
But parts are cheap so I'd parallel two if you need 24 watts.

Got a Pentium 4 heatsink/fan combo kicking around? Screw a couple of
transistors to one of those and you'll be good.

Cheers,

Bob



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