[TenTec] Is there a beefier 2N5301?

[Gary Hoffman]

>>SNIP
> > Or as you say, I'm at the mercy of heat dissipation (buy the 2N5302 and
a
> > 12v fan for the pass heat sink)
>
> If the heat sink won't keep the transistor case temperature in check
> when the crowbar fires a fan won't help. Needs more metal in the heat
> sink, preferably copper for greater heat capacity. The transistor can
> only dissipate those 150 watts (or whatever its rated) if the case can
> be held to 25 degrees C, or an infinite heat sink.
> >
> SNIP

That is where a TEC design would come into play.  You can keep that heatsink
just as cold as you want.

73 de Gary, AA2IZ