This part is a kind of semiconductor called BC549C.

Function of this product has Low Noise Transistors.

Manufacturers : Motorola Inc

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Low Noise Transistors Order this document by BC549B/D NPN Silicon COLLECTOR 1 2 BASE 3 EMITTER BC549B,C BC550B,C 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 BC549 30 30 5.0 100 625 5.0 1.5 12 – 55 to +150 BC550 45 50 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 Resistance, Junction to Case Symbol RqJA RqJC Max 200 [ ... ]

BC549C PDF Datasheet Download