The Hirose DF12(3.0)-36DS-0.5V(86) is a 36-position, 2-row receptacle with center strip contacts from the DF12 series, designed for board-to-board mezzanine stacking at a 3 mm mated height. The 0.020" (0.50 mm) pitch packs 36 circuits into a compact footprint — typical for space-constrained portable electronics, handheld instruments, and internal module interconnects where the board stack height is tight.
The 0.087" (2.20 mm) height above board plus the 3 mm mated stacking height sets the z-axis clearance between the two PCBs. That 3 mm gap is the dimension you design the enclosure standoffs around — too tight for a taller connector, too loose for a 2 mm stack.
Obsolete — Sourcing Reality for the DF12(3.0)-36DS-0.5V(86)
Pitch and Footprint — What the 0.50 mm Means for Routing
At 0.50 mm pitch, the PCB escape routing needs fine-line capability — trace widths and spaces around 0.10 mm to 0.12 mm between the pads, depending on the via-in-pad strategy. This is standard for modern high-density designs but a constraint if your board shop is set up for 0.100" pitch through-hole.