This part is a kind of semiconductor called BCW31.

Function of this product has NPN General Purpose Amplifier.

Manufacturers : GME

Image and pinout :

Some of the text within the PDF file :

NPN General Purpose Amplifier FEATURES z Low current(max.100mA). z Low voltage(max.32V). Pb Lead-free Production specification BCW31/32/33 APPLICATIONS z General purpose switching and amplification. ORDERING INFORMATION Type No. Marking BCW31 BCW32 BCW33 D1 D2 D3 SOT-23 Package Code SOT-23 SOT-23 SOT-23 MAXIMUM RATING @ Ta=25℃ unless otherwise specified Symbol Parameter Value VCBO VCEO VEBO IC ICM IBM PD Rth j-a Tj,Tstg Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current -Continuous Collector Current -Peak Base Current-Peak Total Device Dissipation Thermal resistance from junction to ambient Junction and Storage Temperature 32 32 5 100 200 200 250 357 -55 to +150 Unit V V V mA mA mA mW ℃/W ℃ C177 Rev.B www.gmicroelec.com 1 Prod [ ... ]

BCW31 PDF Datasheet Download