This part is a kind of semiconductor called 2SB1218.

Function of this product has Transistor.

Manufacturers : TY Semiconductor

Image and pinout :

Some of the text within the PDF file :

Product specification 2SB1218 Features High forward current transfer ratio hFE. 1 Emitter 2 Base 3 Collector Absolute Maximum Ratings Ta = 25 Parameter Collector-base voltage Collector-emitter voltage Emitter-base voltage Peak collector current Collector current Collector power dissipation Junction temperature Storage temperature Symbol VCBO VCEO VEBO ICP IC PC Tj Tstg Rating -45 -45 -7 -200 -100 150 150 -55 to +150 Unit V V V A A mW Electrical Characteristics Ta = 25 Parameter Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector-base cutoff current Collector-emitter cutoff current Forward current transfer ratio Collector-emitter saturation voltage Transition frequency Collector output capacitance Symbol VCBO VCEO VEBO ICBO ICEO hFE Testconditons IC = -10 ì [ ... ]

2SB1218 PDF Datasheet Download