This part is a kind of semiconductor called B1531.

Function of this product has 2SB1531.

Manufacturers : Panasonic

Image and pinout :

Some of the text within the PDF file :

Power Transistors 2SB1531 Silicon PNP epitaxial planar type Darlington For power amplification Complementary to 2SD2340 Unit: mm 15.0±0.5 13.0±0.5 4.5±0.2 M Di ain sc te on na tin nc ue e/ d 4.0±0.1 s Features q q q 10.5±0.5 4.0±0.1 2.0±0.1 Parameter Symbol VCBO VCEO VEBO ICP IC Ratings –130 –110 –5 Unit V V V A A 12.5 s Absolute Maximum Ratings Collector to base voltage (TC=25˚C) Collector to emitter voltage Emitter to base voltage Peak collector current Collector current Collector power TC=25°C dissipation Ta=25°C Junction temperature Storage temperature PC Tj Tstg –55 to +150 s Electrical Characteristics Parameter Collector cutoff current Emitter cutoff current (TC=25˚C) ue Symbol ICBO ICEO IEBO hFE1 e/ Collector to emitter voltage VCEO hFE2* [ ... ]

B1531 PDF Datasheet Download