Explore TIP122 pins, signal names, electrical functions and connection guidance for each package.
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Click a lead or use the arrow keys. Front view · B1, C2, E3 · tab = C
Input of the first transistor in the Darlington pair.
Use a current-limiting base resistor and a defined off-state return.
Two base-emitter junctions give a higher on voltage than a single transistor.
Shared collector of the two internal NPN transistors.
Connect to the low side of the controlled load.
The metal tab, shown as contact 4 in the drawing, is also collector. Insulate it from a grounded heatsink where necessary.
Output emitter and circuit return.
Connect to the common control and load ground.
Front view with leads down: B1, C2, E3.
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