Popular transistors.

RM3401 MOSFET transistor.
Pinout. Datasheet.

Package: TO-23
Marking code: A19T.
Type of RM3401 transistor: MOSFET
Type of control channel:P - Channel
Maximum power dissipation (PD): 1,2W
Maximum drain-source voltage (VDSS): -30V
Maximum gate-source voltage (VGS): ±12V
Maximum continuous drain current (ID):4,2A
Maximum pulsed drain current (IDM):30 A
Maximum junction temperature (Tj): 150C
Rise Time (tR):3ns
Input Capacitance (Ciss):880 pF
Output Capacitance (Coss):105 pF
Maximum drain-source on-state resistance (RDS): 0.047 - 0.055 Ohm
Forward Transconductance(gfs):10
RM3401 Datasheet (PDF)