Board-to-Board Mezzanine Connector for Tight Stack Heights
The Hirose DF12NB(3.0)-20DS-0.5V(51) is a 20-position receptacle with center strip contacts from the DF12 series, designed for parallel board stacking at a fixed 3mm mated stack height.
Position Count and Stack Height — What Fits Your Layout
The 20-position count matches the BOM line for a 20-circuit mezzanine link. The 0.50mm pitch forces the PCB trace and via spacing: you need a board capable of routing between 0.50mm-pitch pads on two rows. Compared to the DF12NB(3.0)-14DS-0.5V(51) in the same series, this 20-position variant adds 6 circuits at the same 0.50mm pitch and 3mm stack height. Both use the same footprint class — just a different position count.