2.5mm Stack, 60 Positions, 0.40mm Pitch — Hirose DF40HC Mezzanine Receptacle
The Hirose DF40HC(2.5)-60DS-0.4V(51) is a 60-position receptacle from the DF40 series of fine-pitch board-to-board connectors. The mated stacking height is fixed at 2.5mm — the "(2.5)" in the order code — which sets the board-to-board gap when mated with the matching DF40 series header. This is a surface-mount connector, intended for high-density mezzanine stacking in compact electronics where PCB real estate is tight.
Mating and Footprint Considerations
The 0.40mm pitch demands a precise PCB footprint — the solder pads are narrow and closely spaced, so the board layout must follow the manufacturer's recommended land pattern to avoid bridging during reflow. The gold flash (2.00µin) on the contacts is suitable for moderate mating cycles typical of internal board-to-board connections in portable devices; it is not designed for frequent field reconnects.