Boz Irf610 Pin?

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bawang is right

If looking at the transistor mounted on the heatsink
it is BCE or corresponding GDS for mosfet
from left to right.

This is a standard used by 90%(?) of all TO220 devices
so if you remember BCE, from left to right
you will know.
BCE is easy to remember -
it is in alphabetical order.

BCE can also be called Gate Drain Source.
The function is the same.
 
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