Unshrouded single-row pin strip
The 77311-427-27LF is the 27-position member of Amphenol ICC's BERGSTIK unshrouded header line, a single-row, through-hole pin strip at 2.54 mm pitch. Rated 3 A per contact with tin-plated mating and post surfaces, it carries a UL94 V-0 thermoplastic housing and operates from -65°C to 125°C.
What the ratings mean for board fit
The 2.54 mm pitch and unshrouded profile keep the board footprint compact — the 0.100" (2.54 mm) row spacing matches legacy 0.1-inch grid layouts, and the 0.260" (6.60 mm) mating pin length provides a solid wipe in standard box headers. Tin-on-tin contacts deliver adequate cycle life for low-mate-count applications; the 78.7 µin (2.00 µm) tin thickness on both mating and post sides is consistent across the series.