Board-to-Board Mezzanine Fit — 0.50mm Pitch, 5mm Stack
The DF12E(5.0)-40DP-0.5V(81) is a 40-position, 2-row surface-mount header from the Hirose DF12 series, designed for board-to-board mezzanine stacking. The 0.50mm pitch drives a tight board footprint — expect fine-pitch routing and a small keep-out zone. Outer shroud contacts provide alignment during mating and some mechanical protection for the signal pins. Gold plating at 8.00µin on the mating interface suits moderate mating cycle counts in a controlled environment.
The outer shroud on the header aligns with the receptacle's inner cavity. Confirm the receptacle order code against your assembly drawing before committing the BOM line.