DF40C-12DP-0.4V(51) from Hirose Electric Co Ltd is a compact DF40 series rectangular board-to-board connector designed for high-density SMT interconnect applications. With 12 positions, 0.40 mm pitch, dual-row construction, and gold contact finish, it is well suited for space-constrained electronics that require reliable signal connection between stacked PCBs. Typical use cases include portable devices, industrial control modules, compact embedded systems, consumer electronics, and communication hardware where low profile and stable mating performance matter. The connector’s solder retention feature supports assembly robustness in automated production environments. Based on the provided specifications, the part is currently listed as Active, with sufficient supply status and an estimated EOL date of 2029, which supports ongoing design planning, although engineers should still monitor official manufacturer notices. RoHS compliance information is not explicitly provided in the input data, so compliance status should be treated as information not available and verified through the official datasheet or manufacturer documentation before release to regulated markets.