Whats inside a power transistor? Well some semiconductor to be a transistor of course. How large would you expect the transistor’s die to be?

My guess is, that for a device that can conduct up to 10 A, the die would occupy the bulk of the transistor’s package. What’s your guess?

Lets find out with a teardown of sorts with the following MJE3055 NPN power transistor that comes in a TO-220 package.

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