Single-part PDF, 45.4 KB, covering the 2SK1236 N-channel FET from the Japanese 2SK range. The file name gives only the part number, with no hint of package or vendor, so cross-check the component marking. A sheet of this kind supplies maximum voltage and current, on-resistance, gate threshold and the pin diagram. Technicians rely on it to test a suspect MOSFET, understand its role in a switching circuit, and pick a replacement with adequate ratings and a matching footprint.
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.