View std909 datasheet:

STD909 STD910 ? COMPLEMENTARY SILICON POWER TRANSISTORS ST PREFERRED SALESTYPES COMPLEMENTARY PNP - NPN DEVICES SURFACE-MOUNTING TO-252 (DPAK) POWER PACKAGE IN TAPE & REEL (SUFFIX ”T4”) ELECTRICAL SIMILAR TO BD909 AND BD910 3 APPLICATIONS 1 GENERAL PURPOSE SWITCHING AND AMPLIFIER GENERAL PURPOSE AMPLIFIER DPAK TO-252 DESCRIPTION (Suffix ”T4”) The STD909 and STD910 form complementary NPN - PNP pairs. They are manufactured using Medium Voltage Epitaxial Base technology for cost-effective performance. INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit NPN STD909 PNP STD910 VCBO Collector-Base Voltage (IE = 0) 80 V VCEO Collector-Emitter Voltage (IB = 0) 80 V VEBO Emitter-Base Voltage (IC = 0) 5 V I Collector Current 15 A C