DF36-25S-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 savings and signal reliability matter. As part of the DF36 family, it is suited for dense embedded systems, portable electronics, industrial control modules, and other compact SMT assemblies that need a 25-position interface in tape-and-reel packaging for automated production. Engineers typically select this connector series for high-density layouts, established Hirose connector quality, and compatibility with volume assembly workflows. Based on the provided data, the part uses surface-mount construction, gold contact finishing in the listed feature summary, and supports an operating range of -35°C to 85°C, making it relevant for commercial and light industrial environments. Lifecycle status is currently listed as unknown, so design teams should confirm current manufacturer status before committing to long-term programs. RoHS compliance information is not available in the provided specifications, and buyers should verify compliance and material declarations through official Hirose documentation before release to regulated markets.