DF40C-30DS-0.4V(58) from Hirose Electric Co Ltd is a fine-pitch board-to-board mezzanine receptacle designed for compact electronic assemblies where space, profile, and signal interconnect density matter. As a 30-position, 2-row surface-mount connector with 0.40 mm pitch and gold contact finish, it is well suited for portable devices, industrial control modules, embedded computing boards, medical electronics, and other high-density PCB stacking designs. Engineers typically select this type of connector when they need reliable mating in low-profile architectures and flexible stacking height options across product families. Based on the provided specifications, the part is listed as Active, which supports use in current designs, although lifecycle status should still be confirmed with the manufacturer for long-term programs. RoHS compliance information is not explicitly provided in the supplied data, so compliance status should be treated as information not available until verified through official Hirose documentation or authorized distributor compliance records.