This part is a kind of semiconductor called 2SB1616.

Function of this product has MEDIUM POWER TRANSISTER.

Manufacturers : Rohm

Image and pinout :

Some of the text within the PDF file :

Transistors 2SB1616 2SD2478 (SPEC-B426) (94L-1129-D426) 301 [ ... ]

2SB1616 PDF Datasheet Download