What this connector is
The Amphenol FCI 87900-412HLF is the 12-position member of the BERGSTIK II series — a dual-row unshrouded male header in the classic 0.100" (2.54 mm) pitch family. Board-to-board style, through-hole solder termination, push-pull fastening. All 12 circuits are loaded. The square pin accepts the matching BERGSTIK II receptacle or any 0.100" pitch IDC or header socket with compatible pin geometry.
Ratings that drive the fit decision
Current rating is 5 A per circuit — this is a per-contact figure, so the 12-position header can carry significantly more aggregate current than a single-row equivalent, but the practical limit in a dense dual-row layout is dictated by trace width and pad thermal relief at the board level. Contact finish is 100.0 µin (2.54 µm) of tin on both mating and post side — heavy tin plating supports extended mating cycles without degradation but is not gold-grade for low-level signal integrity in the microvolt range. Voltage rating is 110 V. The insulation height is 0.100" (2.54 mm), which sets the mated stack height profile for the board-to-board pair.
What the pin geometry means for board layout
The contact length in mating is 0.720" (18.29 mm); the post below the board is 0.120" (3.05 mm). That post length is standard for this pitch class — the 0.120" tail seats into the plated through hole and is long enough for wave or hand-solder operations but does not extend far enough for press-fit. Row spacing is 0.100" (2.54 mm), so the two rows are on 0.100" centres — standard dual-row pitch, meaning the board footprint matches every other BERGSTIK II dual-row variant at this row count. The 0.100" insulation height is the board-stack separation when mated; for a mezzanine or perpendicular board-to-board config, confirm the z-height budget clears this.
Where BERGSTIK II fits
Board-to-board headers in this pitch range are the workhorse of industrial control cards, backplane daughtercards, and instrumentation assemblies — they mate with matching shrouded or unshrouded receptacles, IDC sockets, or card-edge connectors at the same 0.100" pitch. The UL94 V-0 rating makes this suitable for equipment where flame retardancy is a code requirement. The push-pull fastening is a friction-latch style — no tool needed to seat or release, which is appropriate for service access but means the pair is not vibration-locked without a separate board-level restraint.