What This Connector Is
The Amphenol FCI 86503-118HLF is a dual-row unshrouded header in the BERGSTIK II series, configured as a board-to-board interconnect with 18 circuits across two rows at the standard 0.100-inch (2.54 mm) pitch. The push-pull fastening holds the mating receptacle without tool actuation — the receptacle housing locks onto the header post and releases by compressing the latch. Contact material is phosphor bronze with a 30.0 µin (0.76 µm) gold or Gold GXT plating on the mating interface, and tin on the solder tail. All 18 positions are loaded. Rated current is 5 A per contact at the stated test conditions.
Board Footprint and Stack Fit
The post length is 0.120 inch (3.05 mm) and the overall contact length is 0.470 inch (11.94 mm) — the contact's square cross-section seats in the plated through-hole; confirm the PCB pad diameter accommodates the square pin without excessive annular ring clearance loss.
Ratings and What They Mean for Your Application
Voltage is rated 110 V — this is a signal and low-power interconnect, not a power bus connector at this pitch. The 5 A per contact rating is the single-circuit ceiling; the real stack temperature rise depends on how many circuits carry current simultaneously and the ambient. UL94 V-0 flammability rating means the housing material self-extinguishes and does not drip under flame exposure — appropriate for enclosed equipment where fire compliance is required. The 30.0 µin (0.76 µm) gold or Gold GXT finish on the mating side gives lower contact resistance and better fretting resistance than tin-only plating — a meaningful difference in applications where the connector sees repeated mating cycles or low-level signal currents. The tin solder tail is optimized for wave or hand solder termination and does not affect the mating interface.