The DF12(4.0)-50DP-0.5V(86): Its 0.50 mm pitch and 50 positions in two rows suit dense parallel-PCB layouts in portable electronics, handheld instruments, and compact modules where z-height is tight.
Stacking height and footprint fit
The (4.0) in the order code locks the mated stacking height to 4 mm — not adjustable. The height above board is 0.130" (3.30 mm), so the mating receptacle must bring the total stack to exactly 4 mm.
Hirose has marked this part Obsolete. No official successor is listed in the DF12 series at this pitch and stack height.
The header includes a board guide to align the part during pick-and-place and prevent skew during reflow. Solder retention anchors the body to the PCB, resisting shear forces from the mating cable or vibration.