What this connector is
The Amphenol 79821-150HLF is the 50-position member of the BERGSTIK II dual-row header family — a board-to-board, through-hole male pin header on 0.100 inch (2.54 mm) pitch, with square pins and an unshrouded face that accepts the matching BERGSTIK II receptacle or any industry-standard 2.54mm pitch IDC socket. The header carries all 50 circuits loaded, phosphor bronze contacts, and gold or Gold GXT plating at 30.0 µin (0.76 µm) on the mating side — a heavier gold grade than simple flash, which directly extends the number of mate/de-mate cycles the contact interface will survive before the plating wears through.
Key ratings and what they mean for fit
Current rating is 5 A per contact — the per-contact figure, not a derated bus total, which makes this suitable for low-level power distribution across the board stack as well as signal. The 110V rating is modest; this is a signal-dominant interconnect, not a power bus header — do not use it as a substitute for a dedicated power header at line voltage. Contact finish on the mating face is gold or Gold GXT at 30.0 µin (0.76 µm). The heavier gold grade resists fretting corrosion in applications with repeated mating, vibration-induced micro-motion at the contact interface, or extended field service without a sealed connector cover. UL94 V-0 on the housing material confirms the black polyphenylene oxide insulator will not support combustion under fault conditions. Fastening type is push-pull — the header posts snap through the PCB and are wave-soldered; there is no screw-lock or latch. The mated pair relies on contact normal force for retention. In high-vibration environments, a board-mounting clip or board-level staking is required to prevent the receptacle working loose from the header face over time.
Where it is used
Board-to-board stacking and board-to-wire intermediate connection in industrial controls, instrumentation, and communications hardware — anywhere a dense 2-row header on a standard 0.100-inch pitch grid serves as the primary interconnect between a daughtercard and backplane or a wire harness节点. The unshrouded header fits inside a DIN-rail terminal block shroud or a cable-connector housing when keyed alignment is handled by the mated housing rather than the header itself.