Explore TIP127 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 PNP in the Darlington pair.
Sink base current through 1 kΩ; connect a 10 kΩ return from base to emitter.
The example driver selects 12 V for off and 7 V for on. A 3.3 V GPIO cannot directly turn off this 12 V high-side stage.
Common collector of the two internal PNP transistors.
Connect the load between collector and ground.
The metal tab is electrically collector; keep heatsinks at a compatible potential or insulate them.
Positive supply and base-drive reference.
Connect to +12 V in the example.
Front-facing TO-220: B1, C2, E3. The DPAK tab is collector pad 2.
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