What it is
The Amphenol FCI BERGSTIK II 79425-440HLF is a 40-position dual-row unshrouded male pin header rated 5 A per circuit at 110V, built for board-to-board interconnects in industrial and instrumentation applications. With 0.100" (2.54mm) pitch and all 40 positions loaded, this through-hole solder header presents a square pin contact into the mating interface and a 0.120" post into the PCB pad. Tin plating at 100.0 µin (2.54 µm) covers both the mating face and the solder-tail post — a uniform finish suited to repeat-mating cycles where the durability ceiling of tin is acceptable for the application duty.
Key ratings and what they mean for your selection
The 5 A per-contact rating at 0.100" pitch is the BERGSTIK II headline — at this density, board trace width and vias derate the practical circuit current below the contact ceiling more often than the contact itself does. 110V is the stated voltage limit; check your trace-to-trace spacing and conformal coat in high-voltage industrial or power-conversion stacks. Push-pull fastening (no latch or clip) means the mating retention depends on friction and pin engagement depth — acceptable for fixed-board configurations; confirm your vibration environment does not demand a positive-lock alternative. 0.100" insulation height matches the post protrusion above the board surface — the mated interface sits flush with or just above the housing face, which governs the board-stack gap in mezzanine assemblies. UL94 V-0 flammability rating on the black housing meets the typical industrial component safety threshold for enclosed equipment.
Applications and environments
Board-to-board stacking in fixed industrial equipment — PLC backplanes, test-and-measurement instrument boards, and factory automation nodes where the connector stays mated through the product life. The unshrouded dual-row layout is pin-compatible with standard 0.100" pitch receptacles and card-edge guides across the BERGSTIK II series and most competing 2.54mm header families.
Sourcing and lifecycle
The 79425 base product number identifies this as the 40-circuit member of the BERGSTIK II family — confirm your BOM position count matches before committing.