This part is a kind of semiconductor called 2SB1186A.
Function of this product has POWER TRANSISTOR.
Manufacturers : Rohm
Image and pinout :
Some of the text within the PDF file :
Transistors 2SB1275 / 2SB1236A / 2SB1569A / 2SB1186A 2SD2211 / 2SD1918 / 2SD1857A / 2SD2400A / 2SD1763A (96-612-A58) (96-744-C58) 277 [ ... ]
2SB1186A PDF Datasheet Download
