This part is a kind of semiconductor called AP1117T-33L.

Function of this product has 1A Low Dropout Positive Adjustable or Fixed-Mode Regulator.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

AP1117 1A Low Dropout Positive Adjustable or Fixed-Mode Regulator Features - 1.4V maximum dropout at full load current - Fast transient response - Output current limiting - Built-in thermal shutdown - Packages: SOT223, TO263, TO252, TO220, SOT89 - Good noise rejection - 3-Terminal Adjustable or Fixed 1.5V, 1.8V, 1.9V, 2.5V, 3.3V, 5.0V General Description AP1117 is a low dropout positive adjustable or fixed-mode regulator with minimum of 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 3.3V logic supply. AP1117 is also well suited for other applications such as VGA cards. AP1117 is guaranteed to have lower than 1.4V dropout at full load current making it id [ ... ]

AP1117T-33L PDF Datasheet Download