The Hirose DF12E(4.0)-50DP-0.5V(80) is a 50-position board-to-board header from the DF12 series, using outer shroud contacts on a 0.020" (0.50mm) pitch in two rows. It is designed for mezzanine stacking applications where the mated height between PCBs is 4mm, with the header standing 0.130" (3.30mm) above the board surface.
The 0.50mm pitch and 50 positions in two rows define a compact footprint — the board layout must match this exact grid. The outer shroud contacts mate with the corresponding DF12 receptacle (the female half of the board-to-board pair), which also carries the 4mm stacking height specification. The surface-mount termination requires reflow soldering; the gold finish on the contacts supports the mating cycle life typical of the DF12 series without the risk of tin whisker growth or fretting corrosion in low-current signal paths.