The Amphenol FCI 79821-144HLF is the 44-circuit dual-row member of the BERGSTIK II board-to-board header series, operating at 0.100" (2.54 mm) pitch throughout. Gold-plated phosphor bronze contacts carry 5 A per circuit at 110 V, and the push-pull push-pull fastening type makes this an unthreaded board-stacking or panel interconnection header — no jack screw or threaded standoff involved, just a positive mate-and-pull release. The header ships in a bag with all 44 positions loaded.
Contact plating and what it means for your application
Contact finish is gold or Gold GXT over 30.0 µin (0.76 µm) on the mating surface — that thickness is well above the functional minimum and puts this firmly in the signal-duty tier. The HLF suffix on the base product number signals tin-lead-free plating on the solder tails, consistent with RoHS/REACH obligations for industrial automation deployments. The 5 A per-contact rating is the circuit-level ceiling; the actual current the header carries depends on how many circuits are simultaneously powered in your stack.
Board footprint and stack geometry
Through-hole solder mount with a 0.200" (5.08 mm) post length. Standard 0.100" dual-row pitch with 0.100" row spacing; square-pin contact shape per. The insulation height is 0.100" (2.54 mm), so the mated pair sits at that z-height above the board surface — the 0.430" (10.92 mm) mating length is the engagement depth, and the overall contact length is 0.730" (18.54 mm).
What this header is used for and how to mate it
Board-to-board style means this header is intended for direct board-stacking or as a panel-feedthrough interconnect in industrial control, automation, and instrumentation equipment. It mates with the matching BERGSTIK II dual-row receptacle or female header in the same pitch and row spacing. The push-pull fastening is non-threaded — mates with hand pressure and releases by pulling. Because the pins are unshrouded and square, alignment during mating is the user's responsibility: the receptacle keying or polarization must guide alignment in production or field assembly. All 44 positions are loaded, so the mating half must carry a full 44-position complement or accept an intentionally partial-mate configuration with unused contacts.
Lifecycle and sourcing posture
Production status is Active per the manufacturer record. No official successor or cross-reference is listed for this base product number — the 79821 is the series anchor, and any alternative within BERGSTIK II would be validated by matching pitch (0.100"), row spacing (0.100"), and position count. Specified into the BOM against an RFQ; sourced to order at BOM quantity. Confirm your stack height and mating half before committing — the 0.100" insulator height and the 0.430" engagement length are the two dimensions that govern fit in a dual-board mezzanine or daughter-card arrangement.