Semiconductor Transistor Case Packages
TO-3, Through-Hole, Metal Case [case mount]
TO-5, Through-Hole, Metal Case
TO-18, Through-Hole, Metal Case
TO-23, Through-Hole, Metal Case
TO-39, Through-Hole, Metal Case
TO-46, Through-Hole, Metal Case
TO-61, Through-Hole, Bolt Mount
TO-66, Through-Hole, Flange Mount
TO-72, Through-Hole, Metal Case
TO-78, Through-Hole, Metal Case
TO-92, Through-Hole, Plastic Case
TO-99, Through-Hole, Metal Case
TO-204, Through-Hole, Metal Case
TO-205, see TO-39
TO-220, Through-Hole, Plastic Case with Metal Tab
TO-254, Through-Hole, Metal Tab
TO-257, Through-Hole, Metal Tab
Screw Mount, Through-Hole, Metal Case
SOT-23; 3-lead surface mount package
SOT-223; 4-lead surface mount package [1 lead is a tab]
Additional types of Transistor cases; IC Package styles.

TO-39 Transistor Package
Editor Note; All of the derating curves I've seen relating to transistor surface mount packages all appear identical, except that the vertical axis varies greatly. But they all start to be derated at 250C, with the curve falling off to zero power dissipation at 1500C.








