This part is a kind of semiconductor called BC557C.

Function of this product has Amplifier Transistors.

Manufacturers : Motorola Inc

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Amplifier Transistors Order this document by BC556/D PNP Silicon COLLECTOR 1 2 BASE 3 EMITTER BC556,B BC557A,B,C BC558B MAXIMUM RATINGS Rating Collector – Emitter Voltage Collector – Base Voltage 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 Symbol VCEO VCBO VEBO IC PD PD TJ, Tstg BC 556 –65 –80 BC 557 –45 –50 –5.0 –100 625 5.0 1.5 12 – 55 to +150 BC 558 –30 –30 Unit Vdc Vdc Vdc mAdc mW mW/°C Watt mW/°C °C 1 2 3 CASE 29–04, STYLE 17 TO–92 (TO–226AA) THERMAL CHARACTERISTICS Characteristic Thermal Resistance, Junction to Ambient Thermal Resista [ ... ]

BC557C PDF Datasheet Download