At 217 KB, this PDF for the 2SC3673 is one of the larger documents in the 2SC367x group and is indexed as a schematic. The 2SC prefix in the JIS system indicates an NPN bipolar transistor; the name provides no variant or revision. Expect ratings, electrical characteristics, graphs and outline dimensions. Technicians use it to confirm pinout before testing, to check whether the part was operated within limits and to vet substitutes, matching polarity, footprint and 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.