At 414 KB this is one of the larger PDFs in the 2SJ series, covering the 2SJ334. Only the part number appears in the name. Under Japanese JIS rules, 2SJ identifies a P-channel FET, and the larger size likely means detailed characteristic graphs alongside the ratings table. The document helps when checking safe operating area, gate charge or thermal limits for a failed switch. Verify the marking on the actual component and match package and pinout before installing any equivalent.
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 @cyberlanelectonik. 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.