This part is a kind of semiconductor called BFG193.

Function of this product has NPN Silicon RF Transistor.

Manufacturers : Infineon Technologies AG

Image and pinout :

Some of the text within the PDF file :

BFG193 NPN Silicon RF Transistor
For low noise, high-gain amplifiers up to 2 GHz
For linear broadband amplifiers
fT = 8 GHz 4 F = 1.3 dB at 900 MHz 3 2 1 VPS05163 ESD: Electrostatic discharge sensitive device, observe handling precaution! Type BFG193 Maximum Ratings Parameter Marking BFG193 1=E Pin Configuration 2=B 3=E 4=C Package SOT223 Symbol VCEO VCES VCBO VEBO IC IB Ptot Tj TA Tstg Value 12 20 20 2 80 10 600 150 -65 ... 150 -65 ... 150 Unit V Collector-emitter voltage Collector-emitter voltage Collector-base voltage Emitter-base voltage Collector current Base current Total power dissipation TS
87 °C 1) Junction temperature Ambient temperature Storage temperature mA mW °C Thermal Resistance Junction - soldering point 2) RthJS
105 K/W 1T is measured on the c [ ... ]

BFG193 PDF Datasheet Download