What this connector is
The Amphenol FCI (FCI) BERGSTIK II 79425-456HLF is a 56-position dual-row unshrouded male pin header in the board-to-board style, 0.100 inch (2.54 mm) pitch, through-hole solder termination. All 56 circuits are loaded. Contacts are phosphor bronze with tin plating on both the mating face and the solder post, 100 µin (2.54 µm) thickness on the mating side — functional-grade plating suited to permanent board-level interconnects where high mating-cycle life is not the primary concern. Insulation height is 0.100 inch (2.54 mm), matching the row pitch — the header sits flush with the board surface and the mated stack height is governed by the receptacle's insulator thickness. The push-pull fastening type means the mating half uses a friction-fit latch rather than a screw lock — typical for internal board-to-board mezzanine or daughter-card connections where vibration is controlled and field service disconnection is infrequent. UL94 V-0 flammability rating on the housing material sets the fire-retardance ceiling for enclosed equipment applications.
Ratings that drive the fit decision
5 A per circuit at 110 V. At 2.54 mm pitch the current density is comfortable for signal and low-level power distribution — the 5 A ceiling is well within the thermal headroom of the phosphor-bronze contact at typical board-level ambient. 0.100 inch (2.54 mm) pitch on a 56-position dual-row header — each row lands on a 2.54 mm grid, compatible with square-post headers across the industry. Post length is 0.120 inch (3.05 mm) and overall contact length is 0.410 inch (10.41 mm) — the through-hole tail length provides adequate solder wetting surface for wave or hand-solder assembly. The 100 µin (2.54 µm) tin plating on the mating side is the limiting factor for reconnection duty — tin-on-tin interfaces degrade faster than gold-plated alternatives under repeated mate/de-mate. For permanent or low-cycle installations this is not a constraint.
Mating half and series context
The BERGSTIK II series is a long-run industrial header family — this 79425-456HLF mates with the matching dual-row BERGSTIK II female receptacle (IDC or crimp-snap) in the same position count and pitch. Because the header is unshrouded, alignment and polarisation depend entirely on the receptacle housing's slot and bump keying — confirm the mating half's keying configuration before committing to the BOM. The square post shape seats in round or square holes — standard for 2.54 mm headers. The push-pull fastening type means the receptacle must carry a compatible friction-lock feature to resist accidental unmating in service.
Sourcing and lifecycle
Listed Active. Quoted to order against BOM quantity.