Hirose DF12(3.5)-20DP-0.5V(86) — 20-Position 0.50mm Pitch Header
The Hirose DF12(3.5)-20DP-0.5V(86) is a 20-position header from the DF12 series, designed for board-to-board mezzanine connections. The connector is surface-mount and specifies a 3.5mm mated stacking height, which sets the board-to-board spacing in the final assembly.
The 0.50mm pitch is tight — fine for signal routing in compact consumer or portable electronics, but it limits per-contact current capacity compared to wider-pitch connectors. The 3.5mm mated stacking height is a fixed dimension: your two PCBs must be spaced exactly 3.5mm apart (board-to-board) when this header is mated with its matching receptacle. The 20 positions in two rows give a 10-per-row layout, so the board footprint needs 10 pads per side at 0.50mm centers.