Indexed as a schematic, this 86.1 KB PDF is named simply 21DQ04 and names no device, board or revision. It sits next to a close sibling ending in 06, which suggests a family of related parts that differ by rating. Any PDF viewer opens it. Use it to look up pin orientation and limits before you remove or substitute a part on a board. Read the last digits stamped on the original component carefully. Fitting a lower-rated variant can lead to a repeat failure after the repair.
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.