This part is a kind of semiconductor called B949.

Function of this product has 2SB949.

Manufacturers : Panasonic Semiconductor

Image and pinout :

Some of the text within the PDF file :

Power Transistors 2SB949, 2SB949A Silicon PNP epitaxial planar type Darlington 0.7±0.1 For power amplification and switching Complementary to 2SD1275 and 2SD1275A 10.0±0.2 5.5±0.2 Unit: mm 4.2±0.2 2.7±0.2 4.2±0.2 s Features 16.7±0.3 7.5±0.2 q High foward current transfer ratio hFE q High-speed switching q Full-pack package which can be installed to the heat sink with one screw s Absolute Maximum Ratings (TC=25˚C) Parameter Symbol Ratings Unit Collector to 2SB949 base voltage 2SB949A VCBO –60 –80 V 14.0±0.5 Solder Dip 4.0 φ3.1±0.1 1.3±0.2 1.4±0.1 0.8±0.1 0.5 +0.2 –0.1 2.54±0.25 Collector to 2SB949 emitter voltage 2SB949A Emitter to base voltage Peak collector current Collector current Collector power TC=25°C dissipation Ta=25°C Junct [ ... ]

B949 PDF Datasheet Download