This part is a kind of semiconductor called 78D05A.

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

Manufacturers : Unisonic Technologies

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 78DXXA LINEAR INTEGRATED CIRCUIT 3-TERMINALS 1A POSITIVE VOLTAGE REGULATOR 1 TO-252  DESCRIPTION The UTC 78DXXA family is monolithic fixed voltage regulator integrated circuit. They are suitable for applications that required supply current up to 1 A. 1 TO-252-3  FEATURES * Peak output current up to 1A. * Fixed output voltage of 5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V and 20V available. * Thermal overload shutdown protection. * Short circuit current limiting. * Output transistor SOA protection. 1 1 SOT-223 TO-251  ORDERING INFORMATION Ordering Number Lead Free Halogen Free - 78DXXAG-AA3-R 78DXXAL-TM3-T 78DXXAG-TM3-T 78DXXAL-TN3-R 78DXXAG-TN3-R 78DXXAL-TNA-R 78DXXAG-TNA-R Note: Pin Code: I: Input G: GND O: Output Package SOT-223 T [ ... ]

78D05A PDF Datasheet Download