This part is a kind of semiconductor called NZT45C11.

Function of this product has PNP Current Driver Transistor.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

D45C11 / NZT45C11 D45C11 NZT45C11 C B E C E C TO-220 SOT-223 B PNP Current Driver Transistor This device is designed for power amplifier, regulator and switching circuits where speed is important. Sourced from Process 5P. See NZT751 for characteristics. Absolute Maximum Ratings* Symbol VCEO IC TJ, Tstg TA = 25°C unless otherwise noted Parameter Collector-Emitter Voltage Collector Current - Continuous Operating and Storage Junction Temperature Range Value 80 4.0 -55 to +150 Units V A °C *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 degrees C. 2) These are steady state limits. The factory should be consulted on applications involving puls [ ... ]

NZT45C11 PDF Datasheet Download