The 2SK2718 is documented in a 412 KB PDF that the catalogue files under schematics, though by its name it is a component datasheet. Following JIS convention, 2SK marks an N-channel FET, so expect breakdown voltage, drain current, on-resistance, capacitances and package details. Use these when matching an equivalent part, interpreting multimeter readings on a suspect transistor, or identifying pins on an unfamiliar case. Any PDF reader opens it, and no maker or revision is given in the file name.
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.