Named 1T405A, this 69.4 KB PDF is filed as a schematic. The A suffix marks a variant of the 1T405 code, and the two should not be assumed interchangeable. The name gives no device, brand or board number, so treat it as component reference material for one part. Open it in a PDF viewer to read the pin layout, package outline and characteristics. Use these when testing the part in circuit or sourcing a replacement. Check that the suffix printed on the part matches as well.
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.