The Amphenol/FCI 87185-431HLF is a 31-position, single-row BERGSTIK® II unshrouded header with a 0.100" (2.54 mm) pitch. It uses square male pins in a through-hole solder termination, with tin plating on both the mating surface and the solder posts. The overall contact length runs 1.238" (31.45 mm), with a mating length of 1.043" (26.49 mm) and a post length of 0.095" (2.41 mm). Rated at 5 A per contact and 110 V, it carries a UL94 V-0 flammability rating on the black insulation.
What the 0.100" Pitch and Unshrouded Design Mean for Your Build
The 0.100" (2.54 mm) pitch fits directly into 0.100" perfboard patterns and legacy prototyping grids. The unshrouded design has no plastic wall around the pins.
Current Rating and Contact Plating — Signal Duty, Not Bus Power
Rated 5 A per contact at 110 V, this header is sized for signal-level interconnects and low-current power distribution — think logic-level lines, sensor inputs, or control signals on a PCB. The tin-on-tin plating (100.0 µin / 2.54 µm on the mating side, tin on the posts) is cost-effective for moderate mating cycles in controlled environments. Tin is not rated for the high-cycle or corrosive-duty applications where gold would be specified; for a connector that will be mated and unmated dozens of times inside a clean enclosure, tin holds up fine. The phosphor bronze contact material provides good spring properties and corrosion resistance for the duty class.
Sourcing and Lifecycle
This part carries an Active lifecycle status from the manufacturer — full production, no end-of-life notice. There is no official successor or cross-reference on record; the 31-position count is specific enough that a substitution would require a full BOM review.