This part is a kind of semiconductor called BD131.

Function of this product has NPN power transistor.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET book, halfpage M3D100 BD131 NPN power transistor Product specification Supersedes data of 1997 Mar 04 1999 Apr 12 Philips Semiconductors Product specification NPN power transistor FEATURES • High current (max. 3 A) • Low voltage (max. 45 V). APPLICATIONS • General purpose power applications. DESCRIPTION handbook, halfpage BD131 PINNING PIN 1 2 3 emitter collector, connected to metal part of mounting surface base DESCRIPTION NPN power transistor in a TO-126; SOT32 plastic package. PNP complement: BD132. 3 2 1 1 2 3 Top view MAM254 Fig.1 Simplified outline (TO-126; SOT32) and symbol. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VCBO VCEO VEBO IC ICM IBM Ptot Tstg Tj Tamb PARAMETER collecto [ ... ]

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