Contact system & plating
The 77311-102-33LF is the 33-position single-row member of the Amphenol ICC (FCI) BERGSTIK unshrouded header family. Mating contacts carry a 30.0µin (0.76µm) gold or GXT finish — the GXT option provides extended durability for repeated mate-unmate cycles in board-to-board interconnects. Rated 3A per contact with a phosphor bronze base, the header operates from -65°C to 125°C and uses a UL94 V-0 black thermoplastic insulator.
Position count & pitch across the series
At 33 positions, this header occupies a 0.100" (2.54mm) pitch single-row footprint — the same pitch used across the BERGSTIK line. The 33-circuit count sits above the common 20- and 30-position variants, suiting applications that need an odd circuit count without moving to a dual-row layout.