This part is a kind of semiconductor called BFS17.

Function of this product has NPN small signal transistor.

Manufacturers : ROHM

Image and pinout :

Some of the text within the PDF file :

Transistors NPN small signal transistor BFS17 BFS17 zFeatures 1) Ideal for RF applications. 2) Mixers and oscillations in TV tuners. 3) RF communications equipment. zPackaging specifications Type BFS17 Package Code Basic ordering unit (pieces) Taping T116 3000 zDimensions (Unit : mm) BFS17 1.3 2.4 0.2Min. (1)Emitter (2)Base (3)Collector 2.9 0.4 (3) 0.95 0.45 (2) (1) 0.95 0.95 1.9 0.15 Each lead has same dimensions Abbreviated symbol : GMA zAbsolute maximum ratings (Ta=25°C) Parameter Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Symbol VCBO VCEO VEBO IC Collector power dissipation PC Junction temperature Tj Storage temperature Tstg ∗ Mounted on a 7×5×0.6 mm CERAMIC SUBSTRATE Limits 25 15 2.5 0.05 0.20 0.25 150 −55 to [ ... ]

BFS17 PDF Datasheet Download