This part is a kind of semiconductor called BF494.

Function of this product has NPN medium frequency transistors.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET book, halfpage M3D186 BF494; BF495 NPN medium frequency transistors Product specification Supersedes data of September 1994 File under Discrete Semiconductors, SC04 1997 Jul 08 Philips Semiconductors Product specification NPN medium frequency transistors FEATURES • Low current (max. 30 mA) • Low voltage (max. 20 V). APPLICATIONS • HF applications in radio and television receivers • FM tuners • Low noise AM mixer-oscillators • IF amplifiers in AM/FM receivers. DESCRIPTION NPN medium frequency transistor in a TO-92; SOT54 plastic package. Fig.1 1 handbook, halfpage 2 3 BF494; BF495 PINNING PIN 1 2 3 base emitter collector DESCRIPTION 3 1 2 MAM258 Simplified outline (TO-92; SOT54) and symbol. QUICK REFERENCE DATA SYMBOL VCBO VCEO ICM [ ... ]

BF494 PDF Datasheet Download