This part is a kind of semiconductor called TS7815.

Function of this product has (TS7800 Series) 3-Terminal Fixed Positive Voltage Regulator.

Manufacturers : Taiwan Semiconductor Company

Image and pinout :

Some of the text within the PDF file :

TS7800 series 3-Terminal Fixed Positive Voltage Regulator ITO-220 Pin assignment: 1. Input 2. Ground 3. Output (Heatsink surface connected to Pin 2) Voltage Range 5V to 24V Output Current up to 1A General Description These voltage regulators are monolithic integrated circuits designed as fixed-voltage regulators for a wide variety of applications including local, on-card regulation. These regulators employ internal current limiting, thermal shutdown, and safe-area compensation. With adequate heatsink they can deliver output currents up to 1 ampere. Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents. This series is offered in 3-pin TO-220, ITO-220 package. Features — [ ... ]

TS7815 PDF Datasheet Download