This part is a kind of semiconductor called 2N3948.

Function of this product has HIGH FREQUENCY TRANSISTOR.

Manufacturers : Motorola

Image and pinout :

Some of the text within the PDF file :

MAXIMUM RATINGS Rating Collector-Emitter Voltage Collector-Base Voltage Emitter-Base Voltage Collector Current Continuous @Total Device Dissipation Ta = 25°C Derate above 25°C Operating and Storage Junction Temperature Range THERMAL CHARACTERISTICS Characteristic Thermal Resistance, Junction to Case Thermal Resistance, Junction to Ambient Symbol vCEO VCBO VEBO 'C PD TJ. Tstg Symbol R 2 page : 'datasheet'

2N3948 PDF Datasheet Download