The Hirose DF12B(4.0)-40DP-0.5V(86) is a 40-position, dual-row board-to-board header from the DF12 series, designed for parallel PCB stacking at a 4 mm mated stack height. Gold-plated contacts (8.00 µin) on the mating surface handle moderate cycle counts typical of internal board interconnects in portable electronics and compact instrumentation.
Board Fit and Assembly Notes
The outer shroud contacts provide alignment and protect the signal pins from damage during blind mating. The 4 mm mated stack height is the vertical dimension between the two PCBs — confirm the z-height budget in the enclosure before specifying.