This part is a kind of semiconductor called BCP56.

Function of this product has NPN General Purpose Amplifier.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

BCP56 BCP56 C E B C SOT-223 NPN General Purpose Amplifier These devices are designed for general purpose medium power amplifiers and switches requiring collector currents to 1A. Sourced from Process 39. Absolute Maximum Ratings* Symbol VCEO VCBO VEBO IC TJ, Tstg Parameter Collector-Emitter Voltage Collector-Base Voltage Emitter-Base Voltage Collector Current - Continuous TA = 25°C unless otherwise noted BCP56 80 100 5 1.2 -55 to +150 Units V V V A °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 temperature of 150°C. 2) These are steady state limits. The factory should be consulted on applications involving [ ... ]

BCP56 PDF Datasheet Download