What the 79821-448HLF is
The Amphenol FCI 79821-448HLF is the 48-position member of the BERGSTIK II dual-row header series, configured as an unshrouded male pin header with 0.100" (2.54 mm) pitch and through-hole termination. It is classified as a Board-to-Board style interconnect, intended for parallel board stacking in industrial automation, instrumentation, and control applications where a 48-circuit signal or low-power path is required. Dual-row layout at 0.100" pitch with 48 positions gives a contact density appropriate for mid-density board-stacking tasks — the pitch matches standard 0.100" routing grids, so via escape and trace routing follow conventional board design rules without specialised geometry. The 5 A per contact current rating handles signal-level and low-power distribution; the 110 V voltage ceiling sets the insulation voltage boundary for the circuit. Contact plating is tin on both the mating face and the solder post, at 100 µin (2.54 µm) thickness — a durable tin grade suited for multiple mating cycles in field-service and production-test contexts. The push-pull fastening type relies on header body geometry and pin insertion depth for retention; there is no independent locking latch, so assess vibration exposure at the application level. The header body is black insulative material rated UL94 V-0, meaning it passes the vertical burn test for flammability — relevant for panel and enclosure builds where fire-retardance is specified. Contact material is phosphor bronze, which provides a balance of spring temper and conductivity for pin-socket applications. All 48 positions are fully loaded; there are no dummy or skipped positions in this variant.
Mating and termination
The 79821-448HLF mates with the matching BERGSTIK II dual-row receptacle or IDC socket housing from the same series — confirm the mating half's position count matches the 48 circuits here, and that the receptacle's contact style (tube or fork) is compatible with the square pin geometry of this header. Termination is through-hole solder — the 0.200" (5.08 mm) tail length provides a compliant solder fillet for wave or hand-solder assembly, and the 0.430" (10.92 mm) mating length gives adequate pin engagement in the receptacle. Overall contact length is 0.730" (18.54 mm). The 0.100" insulation height sets the board-stack spacing when this header is used as the bottom board-mount member in a two-board stack.
Sourcing and lifecycle
No explicit RoHS, REACH, or UL safety certification entry is listed for this part number; the only stated compliance attribute is the UL94 V-0 flammability rating.