This is one of the transistor types.
Part Number: BD139
Description
80V, 1.5A, Complementary Low Voltage Transistor
Package: SOT-32 Pin
Manufacturer: STMicroelectronics
Image
Description
These epitaxial planar transistors are mounted in the SOT-32 plastic package. They are designed for audio amplifiers and drivers utilizing complementary or quasi-complementary circuits. The NPN types are the BD135 and BD139, and the complementary PNP types are the BD136 and BD140, BD139.
Absolute maximum ratings ( Ta=25°C )
Features
1. Products are pre-selected in DC current gain
Application
2. General purpose
BD139 Pinout
BD139 Datasheet PDF
