chumg1gp.pdf datasheet:

CHENMKO ENTERPRISE CO.,LTDCHUMG1GPSURFACE MOUNT NPN Digital Silicon TransistorVOLTAGE 50 Volts CURRENT 30 mAmpereAPPLICATION* Switching circuit, Inverter, Interface circuit, Driver circuit.FEATURE* Small surface mounting type. (SC-88A/SOT-353)SC-88A/SOT353* High current gain. * Suitable for high packing density.* Low colloector-emitter saturation.* High saturation current capability.(4) (3)* two CHDTC124E chips in one package.0.65* Built in bias resistor(R1=22k, Typ. ) 1.30.1 2.00.20.65CONSTRUCTION0.1 (5) (1)0.20.05* One NPN transistors and bias of thin-film resistors in one1.250.1 package.0.150.05 0.90.10.70.10~0.10.1 Min.3 2 1CIRCUIT 2.30.15R1 R1R2 R24 5Dimensions in millimeters SC-88A/SOT353LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 60134).SYMBOL PARAMET