Board-Stacking Selection: Hirose FunctionMax™ FX8C Receptacle
A built-in board guide aligns the receptacle during assembly, protecting the fine-pitch contacts from shear damage. This member of the FX8C family is specified for mated stacking heights of 10mm, 11mm, 12mm, 14mm, and 16mm, giving the board designer a range of z-axis spacing options from a single receptacle footprint. Typical applications include mezzanine card interconnects in telecom line cards, server blade assemblies, and industrial control modules where signal density and board spacing must be matched precisely.
Pitch and Footprint: What the 0.60mm Spacing Means for Layout
The 0.60mm pitch is the critical dimension for the board layout engineer. At this spacing, trace routing between pads requires a controlled impedance stack-up and a fine-line PCB capability — standard 1oz copper with 0.2mm trace/space rules will fit, but the designer should verify the breakout channel width against the fab house's minimum. The two-row arrangement with 60 total positions means 30 contacts per row, and the SMT pads will sit on a 0.60mm grid with a row-to-row offset that the footprint drawing defines. The board guide feature adds two locating posts outside the contact array, which take up additional keep-out area — account for these in the component clearance zone.
Stack Height Range: Matching the Envelope
The FX8C-60S-SV5(92) supports five mated stacking heights: 10mm, 11mm, 12mm, 14mm, and 16mm. This range is achieved by pairing the receptacle with different plug variants in the FX8C series — the receptacle itself has a fixed 8.95mm height above board, and the plug's height determines the final stack. For a 10mm stack, the plug contributes about 1mm of height above its own board; for a 16mm stack, the plug is taller. The buyer must specify the mating plug's order code to lock in the stack height; the receptacle alone does not determine it. This flexibility lets a single receptacle BOM line serve multiple board-spacing configurations, as long as the plug is swapped per build.