This part is a kind of semiconductor called BC558C.

Function of this product has Amplifier Transistors PNP Silicon.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

BC556B, BC557A, B, C, BC558B, C Amplifier Transistors PNP Silicon Features http://onsemi.com • Pb−Free Packages are Available* COLLECTOR 1 MAXIMUM RATINGS Rating Collector - Emitter Voltage BC556 BC557 BC558 Collector - Base Voltage BC556 BC557 BC558 Emitter - Base Voltage Collector Current − Continuous Collector Current − Peak Base Current − Peak 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 ICM IBM PD PD TJ, Tstg VCBO −80 −50 −30 −5.0 −100 −200 −200 625 5.0 1.5 12 −55 to +150 Vdc mAdc 1 2 mAdc mW mW/°C W mW/°C °C 3 Symbol VCEO −65 −45 −30 Vdc Value Unit Vdc 2 BASE 3 EMITTER TO−92 CASE 29 STYLE 17 MARKIN [ ... ]

BC558C PDF Datasheet Download