What this connector is
The Amphenol FCI 75844-101-28LF is the 28-circuit member of the BERGSTIK dual-row header series, configured for board-to-board or cable-level interconnects at 0.100" (2.54mm) pitch. The header carries square male pins with gold GXT contact plating at 30.0 µin on the mating interface, mounted through-hole on a black UL94 V-0 thermoplastic body. The push-pull fastening type and unshrouded profile mean the connector relies on the matching BERGSTIK receptacle housing to achieve positive retention — it is not a self-keying friction-lock header. With a 5 A per-circuit rating at 110 V and an operating range of -65°C to 130°C, the series targets industrial control, instrumentation, and communications equipment where a widely second-sourced 2.54mm header family simplifies procurement and reduces single-vendor exposure.
How the key ratings govern the fit
28 positions across two rows at 2.54mm pitch is the decision variable — confirm the board footprint accepts a dual-row 28-way before committing. The 0.100" row spacing and 0.100" (2.54mm) insulation height together set the mated stack geometry for board-to-board applications; the 0.425" overall contact length and 0.225" (5.72mm) mating contact length are what the designer evaluates against the receptacle's spring-beam engagement depth. The 5 A per-circuit rating is solid for a 2.54mm pitch header, but the 110 V ceiling is the restrictive spec for any power-adjacent use — a designer routing low-voltage DC power should check the 110 V limit against the worst-case circuit voltage before sizing. The gold GXT finish at 30.0 µin is a harder gold alloy than standard matte tin, which translates to better corrosion resistance and higher reconnection cycle durability — relevant for field-serviceable equipment where the header sees repeated mating. Push-pull fastening is the non-obvious differentiator from a standard friction-lock breakaway header: the connector does not have a locking tab that deflects on insertion. Retention depends entirely on the mating receptacle's latch mechanism. For any application where vibration or cable pull-out is a concern, the header alone does not provide positive retention — specify the matching BERGSTIK housing with an appropriate latch.