Datasheet in PDF form titled PCRC 420, a 206 KB document whose name does not reveal the manufacturer or component category with certainty. Open it to confirm the part type, pin functions and electrical ratings before relying on it for a repair. Datasheets like this serve to identify a component, look up its pinout and limit values, and find a suitable replacement or equivalent. Match the marking on the physical part, including any prefix or suffix, against the document header so the right variant is used.
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 @datasheet. 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.