View 2sc1815 utc datasheet:

UTC 2SC1815 NPN EPITAXIAL SILICON TRANSISTOR AUDIO FREQUENCY AMPLIFIER HIGH FREQUENCY OSC NPN TRANSISTOR FEATURES *Collector-Emitter voltage: BVCBO=50V *Collector current up to 150mA * High hFE linearity *complimentary to 2SA1015 1:EMITTER 2:COLLECTOR 3. BASE ABSOLUTE MAXIMUM RATINGS ( Ta=25°C ,unless otherwise specified ) PARAMETER SYMBOL RATING UNIT Collector-base voltage VCBO 60 V Collector-emitter voltage VCEO 50 V Emitter-base voltage VEBO 5 V Collector dissipation(Ta=25 Pc 400 mW Collector current Ic 150 mA Base current IB 50 mA Junction Temperature Tj 125 °C Storage Temperature TSTG -55 ~ +150 °C ELECTRICAL CHARACTERISTICS(Ta=25°C,unless otherwise specified) Parameter Symbol Test conditions MIN TYP MAX UNIT Collector cut-off current ICBO VCB=60V,IE=0 100 nA