The Hirose DF12(3.5)-36DP-0.5V(86) is a 36-position board-to-board header from the DF12 series, with a 0.020" (0.50mm) pitch and two rows of gold-plated contacts. The mated stacking height is 3.5mm, which sets the gap between parallel PCBs in a mezzanine stack.
The 0.020" (0.50mm) pitch is the tightest in the DF12 family — the board footprint must match this fine spacing to route the 36 signal traces out from under the connector.
