The DF12(3.5)20DP0.5V(80: This is a Hirose DF12 series header with outer shroud contacts, 20 positions in 2 rows at 0.50mm pitch, designed for a 3.5mm mated stack height. The gold-plated contacts and SMT mounting suit it for dense board-to-board stacking in portable electronics, handheld devices, and compact modules where the 0.50mm pitch saves board real estate.
Board fit and retention features
Mounted height above board is 0.110" (2.80mm), which combined with the 3.5mm stacking height defines the z-height budget for the mated pair.