What this connector is
The Amphenol FCI (Amphenol ICC) 87900-456HLF is the 56-position member of the BERGSTIK II dual-row board-to-board header family. Pitch is 0.100" (2.54 mm) on both the mating and row-spacing axes, which maps to standard 0.100" grid routing — the header drops into a through-hole footprint without special keep-out beyond the nominal pad and drill. Contacts are square male pins in an unshrouded push-pull body; the insulation is black and UL94 V-0 rated. Tin plating on both the mating face and the solder tail carries 100.0 µin (2.54 µm) thickness — heavier than a flash plate, which puts this above minimum-grade tin for both solderability shelf life and repeat-mating durability. Contact material is phosphor bronze. Rated current is 5 A per circuit; voltage is 110 V. The post length is 0.120" (3.05 mm) with an overall contact length of 0.940" (23.88 mm), giving adequate insertion depth for through-hole engagement. Mating contact length is 0.720" (18.29 mm) and insulation height matches the 0.100" (2.54 mm) pitch — the header sits flush with the board surface at the insulator bottom.
Where it goes and what drives the fit
BERGSTIK II at 0.100" pitch uses the dual-row 56-position geometry. The push-pull fastening is not keyed; the body is unshrouded, so mate alignment relies on the socket chamfer — confirm the mating receptacle before committing the footprint. 5 A per contact at 110 V is well above typical signal duty and covers low-level power distribution within a board-stack. The limiting factor is not the contact current rating itself — it is the circuit density and the total connector current budget in the specific stack design. All 56 positions are loaded, so there is no partial-load option to trade for higher per-circuit derating.
Sourcing and lifecycle
Listed Active with no official successor. Quoted to order against the BOM quantity. Confirm position count against the existing board footprint before committing — BERGSTIK II headers share the 0.100" pitch and dual-row geometry across the series, but the 56-position count is specific to this MPN and fixes the circuit count for the BOM line.