Board-Stacking Selection: 144 Circuits at 0.50mm Pitch
The Hirose FX10A-144S-SV is the 144-circuit receptacle half of the FunctionMax™ FX10 mezzanine connector family. At a 0.020" (0.50mm) pitch across two rows, it packs 144 signal positions into a board footprint that leaves room for escape routing on inner layers — the tight pitch means each signal pair needs a via-in-pad or a microvia stack to route out cleanly. This is a center-strip contact receptacle, meaning the mating interface is a row of contacts along the centerline of the connector body, designed to mate with the FX10 header's outer-shroud contacts. The connector is specified for mated stacking heights of 4mm and 5mm, which sets the board-to-board spacing in the enclosure. The 0.126" (3.20mm) height above board of the receptacle alone means the header height must be chosen to hit the target stack — the FX10A-144P-SV(71) header at 0.138" (3.50mm) height above board, for example, would exceed the 5mm stack if used here, so pair this receptacle with the correct header height for your z-height budget.
Mating and Stack Height Compatibility
This receptacle mates with the FX10 series header, specifically the outer-shroud contact header such as the FX10A-144P-SV(71) for a 144-position match. The mated stacking heights are 4mm or 5mm — the actual stack depends on the header height above board selected. The receptacle's board guide aligns with the header's guide posts during assembly, taking shear off the signal pins.