TIP32CPNP power transistor

TIP32C is a 100 V, 3 A PNP bipolar power transistor for amplification and switching. Base current controls collector current, while the actual operating point is limited by voltage, heat and safe operating area. It is a single transistor, not a Darlington pair. The selected onsemi TIP32CG TO-220 uses base 1, collector 2 and emitter 3. MJD32CT4G is the documented electrically similar DPAK alternative, with the same functions and a surface-mount collector pad. Its power ratings and leakage limits are separate from the through-hole part. The example uses a 12 V positive-side switch, a 100 Ω resistor load and a source-referenced driver that selects 12 V for off or 7 V for on. The driver sinks base current through 330 Ω; a 10 kΩ base-emitter resistor defines the off state.