The Hirose FX10A-140P/14-SV1(91) is a 140-position header from the FunctionMax™ FX10 series, built for board-to-board mezzanine stacking at a 5 mm mated height. The 0.020" (0.50 mm) pitch packs 140 circuits into a dual-row layout — that density means the board layout engineer needs to plan trace escape and via fan-out carefully, because the narrow pitch leaves little room for wide traces between pads. Gold-plated contacts (4.00 µin) on the mating interface handle the signal duty for repeated connect-disconnect cycles in controlled environments, while the ground plate and board guide features help align the pair during blind-mate assembly and provide a low-impedance return path.
5 mm Stack Height — the Z-Axis Budget
The mated stacking height is 5 mm — that is the z-axis dimension from the top of the bottom board to the bottom of the top board when the header and receptacle are fully mated.
How It Stacks Against the 3.50 mm Sibling
The closest same-series peer is the FX10A-140P/14-SV(91) — identical 140-position count, 0.50 mm pitch, and gold plating, but with a 0.138" (3.50 mm) height above board instead of the 4.50 mm of this part. That 1 mm difference in the header height changes the mated stack height: the 3.50 mm version mates to a lower-profile receptacle for a tighter z-axis budget. The FX10A-140P/14-SV1(91) with its 4.50 mm height gives more clearance for components on the underside of the top board. Both are active, both are surface mount — the choice comes down to the board-to-board gap your enclosure allows.