This part is a kind of semiconductor called BC546.

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 • Pb−Free Packages are Available* MAXIMUM RATINGS Rating Collector - Emitter Voltage Symbol BC546 BC547 BC548 VCEO Value 65 45 30 Unit Vdc Collector - Base Voltage BC546 BC547 BC548 VCBO 80 50 30 Vdc Emitter - Base Voltage Collector Current − Continuous Total Device Dissipation @ TA = 25°C Derate above 25°C VEBO IC PD 6.0 Vdc 100 mAdc 625 mW 5.0 mW/°C Total Device Dissipation @ TC = 25°C PD 1.5 W Derate above 25°C 12 mW/°C Operating and Storage Junction Temperature Range TJ, Tstg −55 to +150 °C THERMAL CHARACTERISTICS Characteristic Symbol Max Unit Thermal Resistance, Junction−to−Ambient RqJA 200 °C/W Thermal Resistance, Junction−to−Case RqJC 83.3 °C/W Stresses [ ... ]

BC546 PDF Datasheet Download