cmmt591a.pdf datasheet:

Continental Device India LimitedAn ISO/TS 16949, ISO 9001 and ISO 14001 Certified CompanyPNP EPITAXIAL PLANAR SILICON TRANSISTOR CMMT591A SOT-23PIN CONFIGURATION (PNP)1 = BASE2 = EMITTER3 = COLLECTOR3 MARKING: 59A12Complementary CMMT491AABSOLUTE MAXIMUM RATINGS DESCRIPTION SYMBOL VALUE UNITCollector -Base Voltage VCBO 40 VCollector -Emitter Voltage VCEO 40 VEmitter Base Voltage VEBO 5.0 VPeak Pulse Current ICM 2.0 ACollector Current Continuous IC 1.0 ABase Current IB 200 mAPower Dissipation @Tamb=25 deg C Ptot 500 mWOperating & Storage Temperature Range Tj, Tstg -55 to +150 deg CELECTRICAL CHARACTERISTICS (Ta=25 deg C )DESCRIPTION SYMBOL TEST CONDITION MIN MAX UNITCollector -Base Voltage VCBO IC=100uA, IE=0 40 - VCollector -Emitter Voltage VCEO IC=10mA, IB=0 40 - VEmitter Base Voltage VEBO IE=100uA, IC=0 5.0 - VCollector Cut off