View smbta55 datasheet:

PNP Silicon AF Transistors SMBTA 55 SMBTA 56 High breakdown voltage Low collector-emitter saturation voltage Complementary types: SMBTA 05, SMBTA 06 (NPN) Type Marking Ordering Code Pin Configuration Package1) (tape and reel) 1 2 3 SMBTA 55 s2H Q68000-A3386 B E C SOT-23 SMBTA 56 s2G Q68000-A2882 Maximum Ratings Parameter Symbol Values Unit SMBTA 55 SMBTA 56 Collector-emitter voltage VCE0 60 80 V Collector-base voltage VCB0 60 80 Emitter-base voltage VEB0 4 Collector current IC 500 mA Peak collector current ICM 1 A Base current IB 100 mA Peak base current IBM 200 Total power dissipation, TS = 79 ?C Ptot 330 mW Junction temperature Tj 150 ?C Storage temperature range Tstg – 65 … + 150 Thermal Resistance Junction - ambient2) Rth JA ? 285 K/W Junction - soldering poi