40-Position Right-Angle Plug for Mezzanine Stacking
The Hirose FX2B-40PA-1.27DSL(71) is a 40-position board-to-board plug from the FX2 series, built for parallel PCB stacking with a 1.27 mm pitch that balances routing density against creepage for signal-level voltages.
Board Lock and Right-Angle Termination
The 2-row center strip contact arrangement is specific to the FX2 series and mates with the matching FX2 receptacle — the strip contacts are staggered to maintain signal integrity across the 40 positions.
Position Count Comparison: 40 vs 20 vs 52
The 40 positions of the FX2B-40PA-1.27DSL(71) sit between the 20-position FX2B-20PA-1.27DSL(71) and the 52-position FX2B-52PA-1.27DS(71) in the same FX2B sub-series, all at the same 1.27 mm pitch and right-angle through-hole footprint. The 40-position variant is the mid-density option — it matches a 40-signal bus without wasting board space on unused contacts, while the 20-position is for narrower data paths and the 52-position for wider parallel interfaces. All three carry the same 7.87 µin gold plating and board lock feature, so the choice is purely a circuit-count decision against the BOM.