DF40C(2.0)-30DS-0.4V(51) from Hirose Electric Co Ltd is a fine-pitch rectangular receptacle connector designed for compact board-to-board interconnect applications where space, profile, and assembly efficiency matter. With a 0.40 mm pitch, 30 positions, dual-row layout, and 2 mm mated stacking height, it is well suited for portable electronics, embedded control boards, industrial modules, display assemblies, and other dense SMT designs. Engineers typically select parts in this category for reliable signal interconnection in low-profile products that demand precise mechanical alignment and repeatable automated assembly. The supplied status indicates Active, which is favorable for ongoing production use, although formal lifecycle confirmation should still be verified through Hirose documentation. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance status should be treated as information not available pending manufacturer confirmation. For regulated programs, engineers and procurement teams should request the latest datasheet, RoHS declaration, and related material compliance documents before release to production.