Datasheet in PDF format, 276 KB, named only with the number 91078 and a copy suffix, so the part it describes is not stated in the title. Open it in a PDF viewer to read the manufacturer and part number from the header. Component datasheets are used by repair technicians to confirm pinouts, ratings, typical circuits and package markings when diagnosing or replacing a failed device. Check that the part on your board really matches the document before using it as a reference for substitution.
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 @ic_mosfet_pdf_datasheets. 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.