Datasheet document for a part labelled ST952, provided as a 111 KB PDF. The name gives no manufacturer prefix, package or revision, so the device type and maker should be confirmed on the first page before relying on it. As with any component datasheet, the technician can use it to match the marking on the board to a pinout, check rated voltages and currents, review the recommended application circuit and decide whether a failed part can be swapped for an equivalent from another vendor.
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.