2sd2142.pdf datasheet:

2S 2142 DTRANSISOR (NPN)SOT23 FEATURES Darlington Connection for a High hFE High Input Impedance MARKING: R1M 1. BASE 2. EMITTER MAXIMUM RATINGS (Ta=25 unless otherwise noted) 3. COLLECTOR Symbol Parameter Value Unit VCBO Collector-Base Voltage 40 V VCEO Collector-Emitter Voltage 32 V V Emitter-Base Voltage 12 V EBOI Collector Current 300 mA CP Collector Power Dissipation 200 mW CR Thermal Resistance From Junction To Ambient 625 /W JATj Junction Temperature 150 T Storage Temperature -55+150 stgELECTRICAL CHARACTERISTICS (Ta=25 unless otherwise specified) Parameter Symbol Test conditions Min Typ Max Unit Collector-base breakdown voltage V I =100A, I =0 40 V (BR)CBO C ECollector-emitter breakdown voltage V(BR)CEO IC=10mA, IB=0 32 V Emitter-base breakdown voltage V I =100A, I =0 12 V (BR