Transistor documentation for the 2SC4678 in a 220 KB PDF file, sorted into the schematic category. Under the Japanese JIS system, 2SC designates an NPN bipolar transistor, pointing to datasheet content. No further details appear in the name. Open it to read pinout, package drawing and absolute maximum ratings; this supports testing a suspect part, finding a cross-reference when the original is obsolete, and confirming that a replacement has equal or better voltage and current ratings.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.