This part is a kind of semiconductor called BC639.

Function of this product has NPN medium power transistors.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET book, halfpage M3D186 BC635; BC637; BC639 NPN medium power transistors Product specification Supersedes data of 1997 Mar 12 1999 Apr 23 Philips Semiconductors Product specification NPN medium power transistors FEATURES • High current (max. 1 A) • Low voltage (max. 80 V). APPLICATIONS • Driver stages of audio/video amplifiers. DESCRIPTION NPN transistor in a TO-92; SOT54 plastic package. PNP complements: BC636, BC638 and BC640. PINNING PIN 1 2 3 BC635; BC637; BC639 DESCRIPTION base collector emitter 1 handbook, halfpage 2 3 2 1 3 MAM259 Fig.1 Simplified outline (TO-92; SOT54) and symbol. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VCBO BC635 BC637 BC639 VCEO collector-emitter voltage BC635 [ ... ]

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