Small 48.3 KB PDF covering the 2SA1323 transistor; the _E suffix in the name is not explained. The 2SA prefix, from the Japanese JIS system, designates a PNP transistor in the high-frequency class. This kind of sheet presents the pin layout, case outline, absolute maximum ratings and gain data in compact form. It supports in-circuit and out-of-circuit junction checks, correct orientation when soldering, and comparison of ratings when a replacement or equivalent part has to be selected.
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.