Board-to-Board Mezzanine Fit: 0.40mm Pitch, 40 Positions, 2mm Stack
The Hirose DF40C(2.0)-40DS-0.4V(51) is a 40-position receptacle from the DF40 series, designed for board-to-board mezzanine interconnects where board spacing is tight. The 0.016" (0.40mm) pitch on a dual-row layout packs 40 circuits into a compact footprint — that pitch drives the PCB routing density and rules out standard 0.050" or 0.100" pitch layouts.
Position Count vs Siblings: 30, 40, 50, 60
Within the DF40C(2.0) sub-family, the 40-position receptacle shares the same 0.016" (0.40mm) pitch, 2mm mated stacking height, dual-row layout, and 2.00µin gold contact finish with the 30-position DF40C(2.0)-30DS-0.4V(51) and the 50-position DF40C(2.0)-50DS-0.4V(51). The only variable is position count — match the exact circuit count on your board layout.
Surface-mount termination on a dual-row receptacle.