What the 5748677-3 Backshell Does in a D-Sub Assembly
The TE Connectivity 5748677-3 is a two-piece backshell from the AMPLIMITE HD-20 series, designed to terminate and shield the cable side of a standard 25-position D-sub connector. It fits shell size B, which covers both 25-position standard D-subs and 44-position high-density D-subs. The housing is molded from ABS plastic with a nickel-over-copper plating that provides the EMI/RFI shielding — the shield continuity runs from the cable braid through the backshell to the D-sub shell. Included 4-40 mating screws secure the backshell to the D-sub connector, and the assembly hardware and grommets are supplied in the package.
Position Count and Shell Size — Matching the BOM Line
The 5748677-3 is the 25-position member of the AMPLIMITE HD-20 backshell family, using shell size B. The same series offers a 15-position variant (5748677-2) and a 37-position variant (5748677-4) for shell sizes A and C respectively. The 50-position variant (5748677-5) uses shell size D.
Shielding and Hardware — What Ships in the Bag
Shielded construction is standard on the 5748677-3 — the nickel-over-copper plating on the ABS shell provides the conductive path. The backshell ships with the assembly hardware (4-40 screws) and grommets for cable strain relief. No separate hardware kit is needed; it is ready to install on a 25-position D-sub connector with a round cable.