DF37NC-10DS-0.4V(51) from Hirose Electric Co Ltd is a compact board-to-board receptacle designed for high-density interconnect applications where space, profile, and assembly efficiency matter. As a 10-position, 2-row SMT connector with 0.40 mm pitch and approximately 0.98 mm mated stacking height, it is well suited for portable electronics, compact control modules, wearable devices, imaging equipment, and other miniaturized embedded systems. Engineers typically choose parts in this category when they need reliable mezzanine connection performance in tightly constrained PCB layouts. Based on the provided specifications, the part is listed as Active, which supports consideration for ongoing production designs, although lifecycle should still be confirmed through current manufacturer documentation. RoHS compliance information is not explicitly provided in the supplied data, so compliance status should be treated as information not available pending official datasheet or manufacturer confirmation. For procurement, the listed sufficient supply status and reel packaging are positive indicators for production sourcing.