A 124 KB PDF datasheet labelled SDZS016. The name is a bare document code with no part number, maker or device type, so it is not possible to tell from the file name alone which component it covers; opening it is the only way to identify the content. Reference sheets like this normally give pin functions, ratings and application circuits used for checking or replacing parts. Confirm the described device matches the marking on the board before relying on its data.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @datasheet_technar_org. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.