80 I/O in a 0.50mm Pitch — the DF12 Mezzanine Receptacle
The Hirose DF12A(3.0)-80DS-0.5V(81) is an 80-position, 2-row receptacle from the DF12 series of board-to-board mezzanine connectors. It uses a 0.50mm pitch and center strip contacts to pack 80 signal lines into a compact footprint, with a mated stack height of 3mm — a common spacing for parallel PCB stacking in portable electronics, handheld instruments, and compact embedded systems. The receptacle is surface-mount with gold-plated contacts (8.00µin gold over nickel) and includes a board guide feature to assist alignment during assembly.
The 0.50mm pitch is tight enough that routing all 80 signals out of the inner rows typically requires at least a 4-layer PCB with microvias or blind vias under the footprint. The 3mm mated stack height is fixed — the mating header in the DF12 series must also specify a 3mm stacking height to pair correctly. The receptacle body sits 2.20mm above the board before mating, which sets the clearance needed during pick-and-place and reflow soldering.