Datasheet file coded SDZS13A, a 114 KB PDF, where the A suffix may mark a revised or alternate edition within the SDZS document series; the name does not explain it further. The device covered is not identifiable from the file name, so check the title page for the part number. In general, datasheets help a technician confirm pin assignments, voltage and current limits and reference schematics. Make sure the component marking on the board matches the document before measuring against 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.