View smbta20 datasheet:

NPN Silicon AF Transistor SMBTA 20 High DC current gain Low collector-emitter saturation voltage Type Marking Ordering Code Pin Configuration Package1) (tape and reel) 1 2 3 SMBTA 20 s1C Q6800-A6477 B E C SOT-23 Maximum Ratings Parameter Symbol Values Unit Collector-emitter voltage VCE0 40 V Emitter-base voltage VEB0 4 Collector current IC 100 mA Peak collector current ICM 200 Peak base current IBM 200 Total power dissipation, TS =71 ?C Ptot 330 mW Junction temperature Tj 150 ?C Storage temperature range Tstg – 65 … + 150 Thermal Resistance Junction - ambient2) Rth JA ? 310 K/W Junction - soldering point Rth JS ? 240 1) For detailed information see chapter Package Outlines. 2) Package mounted on epoxy pcb 40 mm ? 40 mm ? 1.5 mm/6 cm2 Cu. 5.91 Semiconductor Group 1