This part is a kind of semiconductor called BFG19.

Function of this product has NPN Silicon RF Transistor (For low noise/ low distortion broadband amplifiers in antenna).

Manufacturers : Siemens Semiconductor Group

Image and pinout :

Some of the text within the PDF file :

BFG 19S NPN Silicon RF Transistor • For low noise, low distortion broadband amplifiers in antenna and telecommunications systems up to 1.5GHz at collector currents from 10 mA to 70 mA • CECC-type available: CECC 50 002/259 ESD: Electrostatic discharge sensitive device, observe handling precaution! Type Marking Ordering Code Pin Configuration BFG 19S BFG19S Q62702-F1359 1=E 2=B 3=E 4=C Package SOT-223 Maximum Ratings Parameter Collector-emitter voltage Collector-emitter voltage Collector-base voltage Emitter-base voltage Collector current Base current Total power dissipation Symbol Values 15 20 20 3 100 12 W 1 150 - 65 ... + 150 - 65 ... + 150 ≤ 75 °C mA Unit V VCEO VCES VCBO VEBO IC IB Ptot Tj TA Tstg 1) TS ≤ 75 °C Junction temperature Ambient temperature Storage temperature [ ... ]

BFG19 PDF Datasheet Download