DF40C-70DP-0.4V(51) from Hirose Electric Co Ltd is a fine-pitch rectangular board-to-board connector designed for compact, high-density electronic assemblies. As a 70-position, 0.40 mm pitch plug with outer shroud contacts and SMT mounting, it is well suited for slim portable devices, industrial control modules, embedded boards, medical electronics, and other space-constrained designs that need reliable interconnect performance. Features such as gold contact finish and solder retention support stable mating and assembly in volume production, while multiple mated stacking height options provide layout flexibility for multilayer product architectures. The listed product status is Active, which is generally favorable for ongoing procurement and new design consideration, although engineers should still confirm long-term manufacturer support. RoHS compliance information is not explicitly provided in the available specifications, so compliance should be treated as information not available pending verification through the official Hirose datasheet, declaration, or manufacturer compliance documentation.