20-Position Mezzanine Receptacle at 0.50mm Pitch
The Hirose DF12NC-20DS-0.5V(51) is a 20-position receptacle from the DF12 series of board-to-board mezzanine connectors. It uses a 0.50mm pitch and a 2-row layout, with center strip contacts that mate to the corresponding DF12 header. The connector is surface-mount, sitting 2.70mm above the board, and supports mated stacking heights of 3.5mm, 4mm, and 5mm depending on the header height chosen.
Stack Height Flexibility for Board Spacing
This receptacle is designed to work with DF12 series headers at three mated stacking heights — 3.5mm, 4mm, and 5mm — giving the board layout engineer options for z-axis clearance between parallel PCBs. The 0.50mm pitch keeps the footprint tight, but the 2-row arrangement at 20 positions means the board escape routing needs care: you're fitting 10 contacts per row into a narrow keep-out zone, so a via-in-pad or fine-trace strategy is typical for the inner rows.
Comparing the 2.70mm and 2.20mm Height Variants
The DF12NC-20DS-0.5V(51) sits 2.70mm above the board. A sibling variant, DF12NC(3.0)-20DS-0.5V(51), shares the same 0.50mm pitch, 20 positions, and gold plating but has a lower 2.20mm board height. The choice between them is driven by the required mated stack height: the 2.70mm receptacle pairs with taller headers for the 3.5mm to 5mm stack range, while the 2.20mm version targets tighter z-axis budgets. Both are active and RoHS-compliant, so the decision is purely mechanical — match the board-to-board gap in your enclosure.