This part is a kind of semiconductor called LD1117.

Function of this product has LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS.

Manufacturers : UTC

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD LD1117/A LINEAR INTEGRATED CIRCUIT LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS „ DESCRIPTION The UTC LD1117/A is a low dropout, 3-terminal positive voltage regulator designed to provide output current up to 800mA/1A, There are adjustable version (VREF=1.25V) and various fixed versions. „ FEATURES * Low dropout voltage * Suitable for SCSI-2 active termination if VOUT set to 2.85V * Output current up to 0.8A for 1117 and 1.0A for 1117A * Built-in current limit and over temperature protection * Available in ±1%(at 25°C) and 2% in all temperature range * Low current consumption * Support MLCC „ ORDERING INFORMATION Ordering Number Lead Free Halogen Free Package LD1117cL-xx-AA3-d-e LD1117cG-xx-AA3-d-e SOT-223 LD1117cL-xx-AB3-d-e LD111 [ ... ]

LD1117 PDF Datasheet Download