This part is a kind of semiconductor called BFG520W.

Function of this product has NPN 9 GHz wideband transistors.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET book, halfpage M3D123 BFG520W; BFG520W/X NPN 9 GHz wideband transistors Product specification Supersedes data of August 1995 1998 Oct 02 Philips Semiconductors Product specification NPN 9 GHz wideband transistors BFG520W; BFG520W/X FEATURES • High power gain • Low noise figure • High transition frequency • Gold metallization ensures excellent reliability. APPLICATIONS RF front end wideband applications in the GHz range, such as analog and digital cellular telephones, cordless telephones (CT2, CT3, PCN, DECT, etc.), radar detectors, pagers, satellite television tuners (SATV) and repeater amplifiers in fibre-optic systems. PINNING DESCRIPTION PIN BFG250W 1 2 3 4 collector base emitter emitter BFG250W/X collector emitter base emitter hand [ ... ]

BFG520W PDF Datasheet Download