This part is a kind of semiconductor called BFG135.

Function of this product has NPN 7GHz wideband transistor.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET BFG135 NPN 7GHz wideband transistor Product specification File under discrete semiconductors, SC14 1995 Sep 13 Philips Semiconductors Product specification NPN 7GHz wideband transistor DESCRIPTION NPN silicon planar epitaxial transistor in a plastic SOT223 envelope, intended for wideband amplifier applications. The small emitter structures, with integrated emitter-ballasting resistors, ensure high output voltage capabilities at a low distortion level. The distribution of the active areas across the surface of the device gives an excellent temperature profile. PINNING PIN 1 2 3 4 base emitter collector DESCRIPTION emitter age BFG135 4 1 Top view 2 3 MSB002 - 1 Fig.1 SOT223. QUICK REFERENCE DATA SYMBOL VCBO VCEO IC Ptot hFE fT GUM PARAMETER col [ ... ]

BFG135 PDF Datasheet Download