Board-to-Board Mezzanine Fit: 0.35mm Pitch, 0.80mm Stack
The Hirose BM23FR0.8-10DS-0.35V(51) is a 10-position receptacle from the BM23 series, designed for board-to-board mezzanine stacking. It uses a center strip contact arrangement on a tight 0.014" (0.35mm) pitch across two rows, with a mated stacking height of 0.80mm.
Position Count and Stack Height
The 10 positions match a 10-signal BOM line. The 0.80mm mated stacking height sets the z-gap between the two PCBs — this is a fixed dimension, so the mating header must also be a BM23 series part with the same 0.80mm stack height to align the contacts properly. The 0.35mm pitch drives the board footprint: routing traces between pads requires careful clearance, and the PCB layout should follow the manufacturer's recommended land pattern to avoid solder bridging.