View bc848 datasheet:

Zowie Technology Corporation General Purpose Transistor NPN Silicon COLLECTOR 3 3 BASE 1 1 BC848A,B,C 2 2 EMITTER SOT-23 MAXIMUM RATINGS Rating Symbol Value Unit Collector-Emitter Voltage VCEO 30 Vdc Collector-Base Voltage VCBO 30 Vdc Emitter-Base Voltage VEBO 5.0 Vdc Collector Current-Continuous IC 100 mAdc THERMAL CHARACTERISTICS Characteristic Symbol Max. Unit o Total Device Dissipation FR-5 Board(1) TA=25 C 225 mW o PD Derate above 25 C 1.8 mW / oC o Thermal Resistance Junction to Ambient R JA 556 C / W o Total Device Dissipation Alumina Substrate,(2) TA=25 C 300 mW o PD Derate above 25 C 2.4 mW / oC o Thermal Resistance Junction to Ambient R JA 417 C / W o Junction and Storage Temperature TJ,TSTG -55 to +150 C DEVICE MARKING BC848A=1J; BC848B=1K; B