This part is a kind of semiconductor called BC548C.

Function of this product has NPN General Purpose Amplifier.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

BC548 / BC548A / BC548B / BC548C Discrete POWER & Signal Technologies BC548 BC548A BC548B BC548C E B TO-92 C NPN General Purpose Amplifier This device is designed for use as general purpose amplifiers and switches requiring collector currents to 300 mA. Sourced from Process 10. See PN100A for characteristics. Absolute Maximum Ratings* Symbol VCEO VCES VEBO IC TJ, Tstg Collector-Emitter Voltage Collector-Base Voltage Emitter-Base Voltage Collector Current - Continuous TA = 25°C unless otherwise noted Parameter Value 30 30 5.0 500 -55 to +150 Units V V V mA °C Operating and Storage Junction Temperature Range *These ratings are limiting values above which the serviceability of any semiconductor device may be impaired. NOTES: 1) These ratings are based on a maximum junction temp [ ... ]

BC548C PDF Datasheet Download