TIP42CPNP power transistor

TIP42C is a 100 V, 6 A PNP bipolar power transistor. Base current controls the load path; allowable operation also depends on collector voltage, pulse duration, cooling and safe operating area. It is a single transistor, not a Darlington. This page follows the archived onsemi TIP42C TO-220 reference, revision 2 of November 2017. With the marked face forward and leads down, the order is base 1, collector 2 and emitter 3. The metal tab is collector. Only this verified through-hole package is offered here. 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.