This part is a kind of semiconductor called BFR90A.

Function of this product has Silicon NPN Planar RF Transistor.

Manufacturers : TEMIC Semiconductors

Image and pinout :

Some of the text within the PDF file :

BFR90A Silicon NPN Planar RF Transistor 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 3 2 94 9308 1 BFR90A Marking: BFR90A Plastic case (TO 50) 1= Collector; 2= Emitter; 3= Base Absolute Maximum Ratings Parameters Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Total power dissipation Tamb ≤ 60°C Junction temperature Storage temperature range Symbol VCBO VCEO VEBO IC Ptot Tj Tstg Value 20 15 2 30 300 150 –65 to +150 Unit V V V mA mW °C °C Maximum Thermal Resistance Parameters Junction ambient on glass fibre printed board (40 x 25 x 1.5) mm3 plated with 35 mm Cu Symbol RthJA Value 300 Unit K/W TELEFUNKEN Semiconductors Rev. A [ ... ]

BFR90A PDF Datasheet Download