DF40C-60DS-0.4V(51) from Hirose Electric Co Ltd is a fine-pitch rectangular board-to-board receptacle designed for compact, high-density electronic assemblies. With 60 positions, dual-row layout, SMT mounting, and a 0.40 mm pitch, it is well suited for portable devices, embedded modules, industrial control boards, medical electronics, and other space-constrained designs where reliable interconnect performance is critical. Engineers typically select this series for low-profile stacking requirements and precise board-to-board signal routing in densely populated PCBs. The listed product status is Active, which supports ongoing design consideration, although the overall lifecycle status is provided as unknown and should be confirmed against current manufacturer documentation. Supply and demand is noted as limited, so procurement teams should plan accordingly for production continuity. RoHS compliance information is not explicitly provided in the supplied data, so engineers should verify RoHS and related material declarations directly with Hirose or authorized distribution sources before release to production.