Component documentation for the 42CTQ030, supplied as a 124 KB PDF and indexed as a schematic. In this naming series the part is generally a dual common-cathode Schottky diode for low-voltage, high-current rectification, such as the output stage of an SMPS. The sheet gives package drawings, pin assignment and electrical curves. Repair technicians rely on it to verify forward drop in diode test mode, identify the common terminal on the tab and select an equivalent with matching ratings.
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.