The Hirose DF12D(4.0)-50DP-0.5V(81) is a 50-position, 0.50 mm pitch SMT header from the DF12 series, designed for board-to-board mezzanine stacking.
Mating and Stacking — What Fits
The stacking height is fixed at 4 mm — the (4.0) in the order code denotes that height. If your design needs a different board-to-board gap, the DF12 series includes variants with other stacking heights, but this specific member is locked to 4 mm.
Surface-mount termination, dual-row layout, with the contacts arranged at 0.50 mm pitch. The 0.50 mm pitch means the PCB footprint needs tight tolerances — a standard 0.50 mm pitch land pattern with solder mask defined pads. The board guide adds mechanical alignment during reflow, reducing tombstoning risk on the thin contacts.