The Hirose DF12D(5.0)-20DP-0.5V(81) is a 20-position, dual-row board-to-board header from the DF12 series, using outer shroud contacts and a 0.50mm pitch.
This part is officially obsolete. No direct replacement is listed in the evidence, so any cross must match the 20-position, 0.50mm pitch, 5mm stack height, and SMT footprint exactly.
Key Specs for the Board Layout
The 0.50mm pitch and 20 positions in two rows set the board footprint density.
