View smbta42m datasheet:

SMBTA 42M NPN Silicon High-Voltage Transistor 4 • High breakdown voltage • Low collector-emitter saturation voltage 5 • Complementary type: SMBTA 92M (PNP) 3 2 1 VPW05980 Type Marking Ordering Code Pin Configuration Package SMBTA 42M s1D Q62702-A1243 1 = B 2 = C 3 = E 4=n.c. 5 = C SCT-595 Maximum Ratings Parameter Symbol Value Unit Collector-emitter voltage VCEO 300 V Collector-base voltage VCBO 300 Emitter-base voltage VEBO 6 DC collector current IC 500 mA Base current IB 100 Ptot 1.5 W Total power dissipation, TS ? 83 °C Junction temperature Tj 150 °C Storage temperature Tstg - 65...+150 Thermal Resistance 1) Junction ambient RthJA K/W ? 100 Junction - soldering point RthJS ? 45 1) Package mounted on pcb 40mm x 40mm x 1.5mm / 6cm2 Cu Semiconductor Group 1