SM3512 datasheet, provided as a PDF of 39.5 KB. No information besides the part number appears in the name; the manufacturer, package and revision are not stated. A technician uses this kind of document to read the pin diagram, electrical characteristics and maximum ratings, which helps when measuring a suspect component or confirming that a replacement is electrically equivalent. Any PDF viewer opens the file. Check that the marking on the board's component matches SM3512 exactly, including any suffix letters, before relying on it.
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.