View bcx19 datasheet:

BCX19 ® SMALL SIGNAL NPN TRANSISTOR Type Marking BCX19 U1 SILICON EPITAXIAL PLANAR NPN TRANSISTOR MINIATURE SOT-23 PLASTIC PACKAGE FOR SURFACE MOUNTING CIRCUITS TAPE AND REEL PACKING THE PNP COMPLEMENTARY TYPE IS BCX17 APPLICATIONS SOT-23 WELL SUITABLE FOR PORTABLE EQUIPMENT SMALL LOAD SWITCH TRANSISTOR WITH HIGH GAIN AND LOW SATURATION VOLTAGE INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V Collector-Base Voltage (I = 0) 50 V CBO E VCEO Collector-Emitter Voltage (IB = 0) 45 V VEBO Emitter-Base Voltage (IC = 0) 5 V IC Collector Current 0.5 A ICM Collector Peak Current 1 A Ptot Total Dissipation at TC = 25 oC 250 mW o T Storage Temperature -65 to 150 C stg o T Max. Operating Junction Temperature 150 C j 1/4 May 200