The 25-Position DB-25 Plug with a Shielded Shell
The TE Connectivity AMPLIMITE HD-20 5-747912-4 is a 25-position D-sub plug with male pins arranged in two rows. It uses the standard DB-25 shell layout (shell size 3), which means it mates with any DB-25 receptacle — the most common shell size for parallel-port, serial, and general-purpose I/O applications. This is a shielded connector, not a plastic D-sub; the metal shell contains radiated emissions and protects against coupled noise in electrically noisy environments. Termination is solder-cup — each wire is stripped, tinned, and soldered into the cup on the back of the pin. No crimp tooling, no die set; just a soldering iron and a steady hand. The connector mounts free-hanging (in-line), meaning it floats on the cable rather than bolting to a panel or PCB. That makes it a natural fit for cable assemblies that terminate in a backshell or are potted for strain relief.
Where the 5-747912-4 Fits in the AMPLIMITE HD-20 Line
The AMPLIMITE HD-20 series covers standard-density D-subs from 9 to 50 positions. This 25-position DB-25 plug is the middle of the range — the shell size that matches the most legacy I/O interfaces. Against the 9-position DB-9 (3-1393480-8) and the 15-position DB-15 (8-1437045-3), the 25-position shell is physically larger and carries more contacts, but the pitch and contact construction are identical across the series. The selection decision is simply the circuit count your cable requires — the DB-25 shell is not a higher-current or higher-voltage variant, it is the same contact system in a bigger shell. The grounding indents on the shell are a feature common to the HD-20 series, not unique to this position count. If your application does not require a shielded shell, an all-plastic D-sub from the same series would be a lighter, lower-cost alternative — but the 5-747912-4 is the metal-shell version, and that is the spec to match on the BOM.