This part is a kind of semiconductor called BFR93.

Function of this product has Silicon NPN Planar RF Transistor.

Manufacturers : Vishay Telefunken

Image and pinout :

Some of the text within the PDF file :

BFR93/BFR93R Vishay Telefunken Silicon NPN Planar RF Transistor Electrostatic sensitive device. Observe precautions for handling. Applications RF amplifier up to GHz range specially for wide band antenna amplifier. Features D High power gain D Low noise figure D High transition frequency 1 1 13 581 94 9280 9510527 13 581 2 3 3 2 BFR93 Marking: R1 Plastic case (SOT 23) 1 = Collector, 2 = Base, 3 = Emitter BFR93R Marking: R4 Plastic case (SOT 23) 1 = Collector, 2 = Base, 3 = Emitter Absolute Maximum Ratings Tamb = 25_C, unless otherwise specified Parameter Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Total power dissipation Junction temperature Storage temperature range Test Conditions Symbol VCBO VCEO VEBO IC Ptot Tj Tstg Value 20 12 2 [ ... ]

BFR93 PDF Datasheet Download