This part is a kind of semiconductor called BF517.

Function of this product has NPN Silicon RF Transistor (For amplifier and oscillator applications in TV-tuners).

Manufacturers : Siemens Semiconductor Group

Image and pinout :

Some of the text within the PDF file :

BF 517 NPN Silicon RF Transistor • For amplifier and oscillator applications in TV-tuners Type BF 517 Marking Ordering Code LRs Q62702-F42 Pin Configuration 1=B 2=E 3=C Package SOT-23 Maximum Ratings of any single Transistor Parameter Collector-emitter voltage Collector-base voltage Emitter-base voltage Collector current Peak collector current Symbol Values 15 20 2.5 25 50 mA Unit V VCEO VCBO VEBO IC ICM Ptot f ≥ 10 MHz Total power dissipation mW 280 150 - 65 + 150 - 65 ... + 150 ≤ 340 °C TS ≤ 55 °C Junction temperature Ambient temperature Storage temperature Thermal Resistance Junction - soldering point 1) Tj TA Tstg RthJS K/W 1) Package mounted on aluminia 15 mm x 16,7 mm x 0,7 mm Semiconductor Group 1 Aug-02-1996 BF 517 Electrical Characteristics at TA = 25° [ ... ]

BF517 PDF Datasheet Download