Series datasheet covering the SMBJ family of surface-mount transient voltage suppressor diodes in the SMB (DO-214AA) package, as a fairly large 999 KB PDF. The manufacturer is not given in the name. Such a document typically tabulates standoff, breakdown and clamping voltages for every type along with marking codes and unidirectional or bidirectional versions. In repair it helps identify a shorted TVS on a power input, read its marking to find the right voltage rating and choose a correct replacement rather than simply removing it.
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_technar_org. 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.