With only 83CNQ in the name, this 241 KB PDF appears to cover a whole series of dual Schottky rectifiers in International Rectifier numbering style rather than one specific part. It is indexed as a schematic, yet no device, brand or board is mentioned. A series sheet is useful for comparing voltage grades within the family and reading the shared pinout and package drawing. Identify the exact grade from the component marking before relying on any single row of the ratings tables.
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.