The header stands 3.85 mm above the board and mates to a matching receptacle to achieve a 4 mm mated stack height — a common gap for parallel PCB sandwiches in compact enclosures.
At 80 positions across two rows, the connector body spans about 24 mm along the board edge. The 3.85 mm height above board combined with the 4 mm mated stack height means the receptacle side contributes roughly 0.15 mm of standoff above the mating board. If your enclosure z-height budget is tight, check that the 4 mm gap clears the tallest component on either board.
The FX8-80P-SV1(91) is ROHS3 compliant.
The FX8-80P-SV(91) shares the same 80-position count, 0.60 mm pitch, gold plating, and dual-row layout, but its board height is 2.85 mm instead of 3.85 mm. That 1.00 mm difference changes the mated stack height — the FX8-80P-SV(91) sits lower, which may matter if your board-to-board gap is under 4 mm. Both are active, surface-mount headers; choose by the z-height budget.