This part is a kind of semiconductor called BC547.
Function of this product has Amplifier Transistors(NPN Silicon).
Manufacturers : ON Semiconductor
Image and pinout :
Some of the text within the PDF file :
BC546B, BC547A, B, C, BC548B, C Amplifier Transistors NPN Silicon Features http://onsemi.com COLLECTOR 1 2 BASE • Pb−Free Package is Available* MAXIMUM RATINGS Rating Collector-Emitter Voltage BC546 BC547 BC548 Collector-Base Voltage BC546 BC547 BC548 Emitter-Base Voltage Collector Current − Continuous Total Device Dissipation @ TA = 25°C Derate above 25°C Total Device Dissipation @ TC = 25°C Derate above 25°C Operating and Storage Junction Temperature Range VEBO IC PD PD TJ, Tstg VCBO 80 50 30 6.0 100 625 5.0 1.5 12 −55 to +150 Vdc mAdc mW mW/°C Watt mW/°C °C www.DataSheet4U.com Symbol VCEO Value 65 45 30 Unit Vdc 3 EMITTER MARKING DIAGRAM Vdc TO−92 CASE 29 STYLE 17 1 2 3 BC 54xx YWWG BC54xx = Specific Device Code Y = Year WW = Work Week G = Pb−Free Package Max [ ... ]