cmmt591.pdf datasheet:

Continental Device India LimitedAn ISO/TS 16949, ISO 9001 and ISO 14001 Certified CompanySOT-23 Formed SMD Package CMMT591SILICON PLANAR EPITAXIAL TRANSISTORSPNP transistorMarkingCMMT = 591Pin configuration1 = BASE2 = EMITTER3 = COLLECTOR312ABSOLUTE MAXIMUM RATINGSCollector-base voltage (open emitter) VCBO max. 80 VCollector-emitter voltage (open base) VCEO max. 60 VEmitter-base voltage (open collector) VEBO max. 5 VCollector current IC max. 1 APeak Pulse current ICM max. 2 ABase current IB max. 200 mATotal power dissipation at Tamb = 25C Ptot max. 500 mWJunction temperature Tj max. 150 CD.C. current gainIC = 500 mA; VCE = 5 V hFE min. 100max. 300Transition frequency at f = 100 MHzIC = 50 mA; VCE = 10 V fT min. 150 MHzContinental Device India Limited Data Sheet Page 1 of 4CMMT591RATINGS (at TA = 25C unless otherwis