This part is a kind of semiconductor called BC556B.

Function of this product has PNP general purpose transistors.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET book, halfpage M3D186 BC556; BC557 PNP general purpose transistors Product specification Supersedes data of 1997 Mar 27 1999 Apr 15 Philips Semiconductors Product specification PNP general purpose transistors FEATURES • Low current (max. 100 mA) • Low voltage (max. 65 V). APPLICATIONS • General purpose switching and amplification. DESCRIPTION PNP transistor in a TO-92; SOT54 plastic package. NPN complements: BC546 and BC547. PINNING PIN 1 2 3 emitter base collector BC556; BC557 DESCRIPTION 1 handbook, halfpage 2 3 3 2 1 MAM281 Fig.1 Simplified outline (TO-92; SOT54) and symbol. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VCBO BC556 BC557 VCEO collector-emitter voltage BC556 BC557 VEBO IC I [ ... ]

BC556B PDF Datasheet Download