At a 0.016" (0.40mm) pitch across two rows, it packs 80 I/O into a compact footprint — typical for tight PCB layouts in portable electronics, handheld instruments, or embedded modules where every millimeter of board real estate counts. The mated stack height lands at 4mm, with the receptacle itself sitting 0.090" (2.28mm) above the board. That z-height budget fits inside a slim enclosure — think tablet internals, camera modules, or sensor boards stacked on a main logic board. The outer shroud contacts provide float, meaning the connector self-aligns during mating to compensate for board-to-board misalignment, which is critical at this pitch.
At 80 positions in two rows, each row is 40 contacts, so the board footprint spans roughly 16mm per row. Routing traces out from under the connector requires fine-line PCB capability; vias-in-pad or microvias are common in production designs at this density. That's not a high-cycle automotive or hot-plug duty; it's sized for the few dozen mates a stacked board sees in its life. The SMT tails are tin-plated for solderability on the board side.
ROHS3 compliant per the listing, so it clears EU and similar regulated markets without an exemption check.