The Hirose DF12D(4.0)30DP0.5V80 is a 30-position header from the DF12 series, designed for board-to-board mezzanine stacking. The header is surface-mount and includes a board guide feature to align the boards during assembly, taking shear off the fine-pitch signal pins.
4mm Stack Height — The Fit Decider
The 4mm mated stacking height is the non-negotiable dimension for this mezzanine connector. The 0.50mm pitch gives 30 signal paths in a compact footprint, but the routing density on the board must accommodate the fine-pitch pads. The header's 0.130" (3.30mm) height above the board means the component stands well clear of the solder side, leaving room for passives underneath.