View 2sd1757k datasheet:

2SD1757K Transistors Power Transistor (15V, 0.5A) 2SD1757K External dimensions (Units : mm) Features 1) Low VCE(sat). (Typ.8mV at IC/IB = 10/1mA) 2) Optimal for muting. 1.6 Absolute maximum ratings (Ta = 25°C) 2.8 Parameter Symbol Limits Unit Collector-base voltage VCBO 30 V 0.3to0.6 Collector-emitter voltage VCEO 15 V Each lead has same dimensions Emitter-base voltage VEBO 6.5 V (1) Emitter(Source) Collector current IC 0.5 A ROHM : SMT3 (2) Base(Gate) Collector power dissipation PC 0.2 W (3) Collector(Drain) EIAJ : SC-59 Junction temperature Tj 150 °C Storage temperature Tstg -55~+150 °C Packaging specifications and hFE Type 2SD1757K Package SMT3 hFE QRS * Marking AA Code T146 Basic ordering unit (pieces) 3000 * Denotes hFE Electrical characteristics