The BD139 from STMicroelectronics is a through hole NPN complementary low voltage transistor in TO-126 (SOT-32) package. This device manufactured in epitaxial planar technology. Used for audio amplifiers and drivers, utilizing complementary or quasi complementary circuits.
Collector to emitter voltage (Vce) is 80V
Collector current (Ic) is 1.5A
Power dissipation (Pd) is 12.5W
Collector to emitter saturation voltage of 500mV at 0.5A collector current
DC current gain (hFE) of 25 at 0.5A collector current