The Hirose DF12NC(3.0)-40DP-0.5V(51) is a 40-position header from the DF12 series of board-to-board mezzanine connectors. The connector is designed for parallel board stacking at a fixed 3mm mated height, with a 2.30mm profile above the board surface. Surface-mount termination suits automated pick-and-place and reflow soldering lines. Gold-plated contacts (8.00µin) provide stable contact resistance for signal-level currents through repeated mating cycles.
3mm Stack Height — The Dimension That Decides the Fit
The mated stacking height is 3mm — this is the distance between the two parallel PCBs when the header is mated with its matching receptacle.