The Hirose DF12-30DS-0.5V(80) is a 30-position, 2-row receptacle with center strip contacts on a tight 0.020" (0.50mm) pitch — built for board-to-board mezzanine stacking in compact electronics. It's a surface-mount part with a height above board of 0.106" (2.70mm), and it mates with matching DF12 series headers to achieve mated stacking heights of 3.5mm, 4mm, or 5mm.
Obsolete — Sourcing Reality
This part is officially obsolete. There's no listed replacement from Hirose in the evidence, so the usual channel for this one is surplus or broker stock.
The 0.50mm pitch is tight — it saves board real estate but demands careful routing. That 30 positions in two rows means the footprint is narrow, so you can run traces between pads if the board house can hold the tolerances. The gold contacts give you a solid mating cycle life; this isn't a one-and-done connector. And the board guide helps when you're stacking boards blind — it self-aligns before the contacts take the load.