2N5400 transistor datasheet marked Sam, a 56.9 KB PDF that probably originates from Samsung, although the name alone cannot prove it. The part is a high-voltage PNP bipolar transistor commonly packaged in TO-92. The sheet should give maximum ratings, hFE groups and the lead identification drawing. Technicians check it when a board uses parts from that supplier or when cross-referencing substitutes. Always compare emitter, base and collector positions with the installed device, because vendors do not always agree on pin order.
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.