What This Header Is
The Amphenol FCI (Amphenol FCI Connectors) 79425-102HLF is the 2-position-per-row member of the BERGSTIK II dual-row header series — a 0.100-inch (2.54 mm) pitch board-to-board interconnect with push-pull (friction-lock) mating and through-hole solder termination. The header has two rows of two positions, all loaded. The contacts are phosphor bronze with gold or Gold GXT plating at 30.0 µin (0.76 µm) on the mating face — a mid-tier precious-metal plate that supports repeated matings. Rated 5 A per contact at the UL94 V-0 housing's thermal limit, and 110 V between circuits.
Fit and Footprint for Board Layout
The 0.100-inch row spacing and 0.120-inch (3.05 mm) tail length sit squarely in the standard 2.54 mm header footprint — it drops into any board designed for the BERGSTIK II footprint without routing or via-pattern changes. The 0.100-inch insulation height governs the mated stack gap between parallel boards. Square pin shape and push-pull fastening mean it requires no jack-screw or tool to mate or unmate — the friction lock holds during vibration in industrial environments, though the unshrouded body means alignment relies on the housing polarisation rib and the board-mount shoulders rather than a guided shroud. The 0.190-inch (4.83 mm) mating pin length and 0.410-inch (10.41 mm) overall contact length define the lead-in depth into the matching receptacle.