The 0.020" (0.50 mm) pitch is the tightest in the FH family — each signal pair sits on a 0.50 mm grid, which forces dense routing on the PCB and a narrow keep-out zone between the two boards. The dual-row arrangement packs 220 circuits into a footprint that a coarser-pitch connector would need significantly more board edge to accommodate. The 0.175" (4.45 mm) height above board, combined with the 5 mm mated stack height, sets the exact gap between the two PCBs — a dimension that must match the enclosure's z-height budget and the clearance for any components on the underside of the top board. The outer shroud contacts are fully enclosed, which protects the mating interface during handling and alignment. The board guide and pick-and-place features are built into the part — the board guide helps self-align the two halves during assembly, and the pick-and-place surface lets automated lines handle the part without a custom nozzle. Surface-mount termination keeps the assembly reflow-compatible, avoiding a separate wave-solder step.
The gold contact finish is 200.0 µ" (5.08 µm) thick. This heavy plating supports reliable contact in environments where corrosion or fretting is a risk.
How It Compares: 4-1827253-8 vs. 1-120532-2
The 1-120532-2 is a different connector entirely — it uses a 0.039" (1.00 mm) pitch, has 84 positions, and a 0.250" (6.35 mm) stack height. The 4-1827253-8 at 0.50 mm pitch and 220 positions is for a much denser signal set and a lower board-to-board gap. The 1-120532-2 is not a functional substitute; the pitch, position count, and stack height are all mismatched. No direct cross-reference exists between the two.
It is ROHS3 compliant, which covers the current EU RoHS exemption set. The base product number is 1827253; the full 4-1827253-8 suffix denotes the specific plating, packaging, and feature variant.