# TO-3 Transistor replacement needed that does not protrude through the chassis

I have a linear power supply that uses two 2N3771G. They are TO-3 style, and are exposed outside the chassis, on the heatsink.

I need to move this power supply into a new chassis, for commercial reasons.

I'm hoping to find a replacement transistor that can mount inside the new chassis, but not stick out through it. The new chassis will have heatsinks exposed on the outside.

Here are the specs of the 2N3771G:

$V_{CEO}$ = 40V max
$I_C$ = 30A max
$h_{FE}$ = 15 min
$h_{FE}$ = 60 max

How can I find a substitute?

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How much power are these transistors burning? – The Photon May 30 '12 at 4:59
@ThePhoton - Wood is burned, not power. Power is consumed. – stevenvh May 30 '12 at 5:47
@stevenvh, in engineering, "burn" also has the meaning of "turn to heat." Some words have multiple meanings. – markrages May 30 '12 at 5:53
@markrages - steam train engineering? :-) – stevenvh May 30 '12 at 5:53
@markrages - Oh, I know! They're the origin of the word engineer. And they burned a lot of coal. – stevenvh May 30 '12 at 6:37