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PNP Darlington power transistor

TIP127 Internal Circuitry

Explore the internal circuitry and functional stages of TIP127.

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Inside TIP127

Two PNP stages, common collector and internal discharge resistors.

TIP127 compact two PNP Darlington circuit with common collector and base-emitter shunt resistors.
Original functional drawing based on the manufacturer’s internal schematic. Resistor values are approximate.

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Select a stage to see its role and connections

First PNP stage

Base current controls the first transistor.

Second PNP stage

The first emitter feeds the second base; both collectors are joined.

Internal return paths

TIP127’s reference shows approximately 8 kΩ and 120 Ω shunts; this is a functional schematic.

Component view