This part is a kind of semiconductor called LD1117.

Function of this product has Adjustable and fixed low drop positive voltage regulator.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

LD1117 Adjustable and fixed low drop positive voltage regulator TO-220 DPAK Datasheet - production data flows mostly into the load. Only a very common 10 µF minimum capacitor is needed for stability. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 1 % at 25 °C. The adjustable LD1117 is pin to pin compatible with the other standard. Adjustable voltage regulators maintaining the better performances in terms of drop and tolerance. SOT-223 SO-8 Features • Low dropout voltage (1 V typ.) • 2.85 V device performances are suitable for SCSI-2 active termination • Output current up to 800 mA • Fixed output voltage of: 1.2 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V • Adjustable version availability (VREF = 1.25 V) • Internal current and thermal [ ... ]

LD1117 PDF Datasheet Download