This part is a kind of semiconductor called LM7807.

Function of this product has 3-TERMINAL 1A POSITIVE VOLTAGE REGULATOR.

Manufacturers : UTC

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD LM78XX LINEAR INTEGRATED CIRCUIT 3-TERMINAL 1A POSITIVE VOLTAGE REGULATOR 1 TO-220  DESCRIPTION The UTC LM78XX family is monolithic fixed voltage regulator integrated circuit. They are suitable for applications that required supply current up to 1 A.  FEATURES * Output current up to 1A * Fixed output voltage of 5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V and 24V available * Thermal overload shutdown protection * Output transistor SOA protection  ORDERING INFORMATION Ordering Number Lead Free Halogen Free LM78XXL-TA3-T LM78XXG-TA3-T LM78XXL-TF3-T LM78XXG-TF3-T LM78XXL-T2Q-T LM78XXG-T2Q-T LM78XXL-T92-B LM78XXG-T92-B LM78XXL-T92-K LM78XXG-T92-K Note: Pin Assignment: O: Output G: GND I: Input Package TO-220 TO-220F TO-262 TO-92 TO-92 1 T [ ... ]

LM7807 PDF Datasheet Download