What This Connector Is
The Amphenol FCI 86503-156HLF is the 56-position top-of-range member of the BERGSTIK II dual-row board-to-board header series. It mates with the matching BERGSTIK II female receptacle to form a compact, push-pull stacking interconnect between parallel PCBs — the 0.100 inch (2.54 mm) pitch and square male pin geometry are the defining footprint of this class. All 56 circuits are loaded with gold or Gold GXT contact plating at 30.0 µin (0.76 µm) on the mating face, rated 5 A per circuit at up to 110 V. The housing is black glass-filled polyester (UL94 V-0), which sets the upper temperature and flame-resistance boundary for the assembly. Push-pull fastening — without a locking latch — keeps the profile low and the mating action repeatable, making this suited to internal board-stack applications where the pair is not routinely disconnected after initial assembly.
Key Ratings and What They Mean
Five amps per circuit is the per-contact limit at the stated temperature reference, not a bus rating — the 56 circuits carry no shared derating penalty unless the board layout imposes a common thermal path. The 30.0 µin gold plating on the mating surface gives this part significantly higher reconnection cycle life than tin-plated equivalents in the same series. The 110 V rating is the dielectric withstand; verify this against your actual working voltage with appropriate creepage and clearance at the 2.54 mm pitch.