Part datasheet in PDF form, 420 KB, for the 2SJ401 P-channel FET; the catalogue lists it as a schematic. The 2SJ code follows Japanese JIS rules, with J indicating a P-channel field-effect device. No maker, package or date is included in the name. Open it in any PDF reader to read absolute maximum ratings, electrical characteristics and terminal layout, then use those figures to test the device or to choose an equivalent with equal or higher voltage and current ratings.
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.