The Hirose DF12(3.0)-32DP-0.5V(86) is a 32-position, 0.50mm pitch board-to-board header with outer shroud contacts. It sits in the DF12 series as the 3mm stacking height variant — the "(3.0)" in the order code tells you the mated board gap is 3mm, not the 2.5mm or 4mm options the series also offers. This is a mezzanine interconnect for tight enclosures where you need to stack two PCBs 3mm apart and route 32 signals across a 0.50mm pitch grid.
The 3mm mated height is the critical dimension for your board stack: swap in a 2.5mm or 4mm variant and the whole assembly shifts. The outer shroud protects the 32 pins from bending during blind mate in a box build, which is the usual failure mode on unshrouded headers at this density.
This is a surface-mount header — no through-hole tails, so the board must have SMT pads at 0.50mm pitch. It mates with the corresponding DF12 series receptacle (the female half) that also has a 3mm stacking height. Gold-on-gold contact interface gives reliable performance across the rated mating cycles.