Popular transistors.

IRF9540 MOSFET transistor.
Pinout. Datasheet.

Package: TO-220AB, 1-gate, 2-drain, 3 - sourse, 4-drain.
Type of IRF9540 transistor: MOSFET
Type of control channel: P - Channel
Maximum power dissipation (PD): 150W
Maximum drain-source voltage (VDSS): -100V
Maximum gate-source voltage (VGS): ±20V
Maximum continuous drain current (ID):19A
Maximum pulsed drain current (IDM):72A
Maximum junction temperature (Tj): 175C
Rise Time(tR):73ns
Input Capacitance (Ciss):1400 pF
Output Capacitance (Coss):590pF
Maximum drain-source on-state resistance (RDS): 0.2 Ohm
Forward Transconductance(gfs):6,2