DF40C-20DP-0.4V(58) from Hirose Electric Co Ltd is a fine-pitch board-to-board mezzanine connector designed for compact electronic assemblies where space, profile, and connection reliability are critical. As a 20-position, 2-row surface-mount plug with outer shroud contacts, gold contact finish, and solder retention feature, it is well suited for mobile devices, industrial control modules, compact medical electronics, embedded computing, and other high-density PCB interconnect applications. Engineers typically select this series when they need low-profile stacking with multiple supported mated heights and dependable signal interconnection in miniaturized designs. Based on the provided supply data, procurement conditions currently indicate shortage, so sourcing strategy should be planned carefully for ongoing builds or new product introduction. Lifecycle status is listed as unknown, which means design teams should confirm current manufacturer status before long-term commitment. RoHS compliance information is not available in the provided data, so engineers should verify RoHS and related material declarations directly with Hirose or official documentation.