TIP41CNPN power transistor

TIP41C is a 100 V, 6 A NPN 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 TIP41C 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 resistor load and a buffered 0/5 V base driver through 330 Ω. A 10 kΩ base-emitter resistor defines the off state. Calculated readings use explicit voltage assumptions rather than treating the transistor as an ideal switch.