What this connector is
The Amphenol 79821-112HLF is the 12-circuit member of the BERGSTIK II dual-row header series — a 2-row, 0.100" (2.54mm) pitch male pin header rated 5A per circuit at 110V. It is an unshrouded square-pin header with push-pull (friction-lock) engagement, through-hole solder tails, and black glass-filled polyester housing meeting UL94 V-0. All 12 positions are fully loaded. The 30.0µin (0.76µm) gold or Gold GXT plating on the mating interface gives this connector substantially better cycling durability than tin-plated variants in the same series.
Fit for board-to-board stacking
Contact material is phosphor bronze — the base product number 79821 maps to this standard series configuration.
Where it is used
Board-to-board signal and power interconnect at 0.100" pitch is the standard footprint for low-current parallel bus routing, debug headers, and daughter-card edge connectors across industrial control, instrumentation, and consumer electronics. The UL94 V-0 housing rating makes it suitable for equipment requiring flame-retardant materials in the interconnection layer.
Sourcing
The 79821-112HLF is listed Active — quoted to order against BOM quantity with the pitch, circuit count, and gold plating confirmed against the listed series. No official successor or cross-reference appears in the current record; confirm the mating half and board footprint before committing to a BOM position.