A 90.4 KB PDF identified solely by the code 2SC4451. Under Japanese JIS semiconductor naming, the 2SC prefix marks an NPN transistor of the high-frequency type, so this schematic-category entry should be read as a datasheet. The file name says nothing about package or variant. Open it in a standard PDF viewer to check electrical characteristics, maximum ratings and outline dimensions, and confirm that the marking on the part being replaced matches before relying on the figures.
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.