This part is a kind of semiconductor called T7815CT.

Function of this product has PRECISION 1A REGULATORS.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

L7800AB/AC SERIES PRECISION 1A REGULATORS s s OUTPUT CURRENT IN EXCESS OF 1A OUTPUT VOLTAGES OF 5; 6; 8; 9; 12; 15; 18; 20; 24V THERMAL OVERLOAD PROTECTION OUTPUT TRANSITION SOA PROTECTION 2% OUTPUT VOLTAGE TOLERANCE GUARANTEED IN EXTENDED TEMPERATURE RANGE TO-220 TO-220FP TO-220FM s s s s DESCRIPTION The L7800A series of three terminal positive regulators is available in TO-220, TO-220FP, TO-220FM and D2PAK packages and several fixed output voltages, making it useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problem associated with single point regulation. Each type employs internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is pro [ ... ]

T7815CT PDF Datasheet Download