Datasheet in PDF form labelled STB451D01-1, version 2.1, dated 2023-08-14, about 2.11 MB. The name does not say what kind of component or module the part number refers to, so the first pages should confirm the device type and package. Datasheets like this are used to check pinouts, absolute maximum ratings, supply voltages and typical application circuits when diagnosing or substituting a part. Compare the part marking on the board with the document title and revision before relying on its pin assignments.
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 @cdispdata. 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.