DF37C-40DP-0.4V(53) from Hirose Electric Co Ltd is a fine-pitch rectangular connector designed for compact board-to-board interconnect applications where space, profile, and assembly efficiency matter. With a 0.40 mm pitch, 40 positions, dual-row layout, SMT mounting, and gold-plated contacts, it fits densely packed electronics that require reliable signal routing in slim devices and high-density assemblies. Typical use cases include portable electronics, industrial control boards, embedded modules, display assemblies, and other compact interconnect designs. As an active Hirose connector series item, it is positioned as a practical option for engineers seeking a low-profile, production-ready connector from a well-known interconnect supplier. Lifecycle status was provided separately as unknown, so long-term program teams should verify current manufacturer lifecycle guidance before locking it into new designs. RoHS compliance information is not explicitly provided in the available specifications, so engineers should confirm RoHS and related material declarations directly through official manufacturer documentation.