This part is a kind of semiconductor called BD140.

Function of this product has Complementary low voltage transistor.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

BD135 - BD136 BD139 - BD140 Complementary low voltage transistor Features ■ Products are pre-selected in DC current gain Application ■ General purpose 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. 1 2 3 SOT-32 Figure 1. Internal schematic diagram NPN Table 1. Device summary Order codes BD135 BD135-16 BD136 BD136-16 BD139 BD139-10 BD139-16 BD140 BD140-10 BD140-16 Marking BD135 BD135-16 BD136 BD136-16 BD139 BD139-10 BD139-16 BD140 BD140-10 BD140-16 May 2008 Rev 5 Package SOT-32 PNP Packaging Tube 1/9 www.st.com 9 Contents Contents [ ... ]

BD140 PDF Datasheet Download