This part is a kind of semiconductor called L1084-3.3.

Function of this product has 5A Fixed Low Dropout Linear Regulator.

Manufacturers : Niko

Image and pinout :

Some of the text within the PDF file :

NIKO-SEM 5A Fixed Low Dropout Linear Regulator (LDO) FEATURES L1084-3.3 TO-252,263,220 GENERAL DESCRIPTION The L1084 is a positive and low dropout three-terminal voltage regulator with 5A output current capability. This device is designed for use in low voltage applications that offers lower dropout voltage and faster transient response. This device is fully protected against over current faults, over temperature operation, reversed input polarity, reversed lead insertion, transient voltage spike …etc. On-Chips trimming the reference voltage to 1% and features the low dropout of maximum 1.45 volts. The L1084 Series regulators are available in the popular industry standard TO-263 TO-220 and TO-252 packages. z Very easy to use, it requires only two external resisto [ ... ]

L1084-3.3 PDF Datasheet Download