DF40C(2.0)-20DS-0.4V(58) from Hirose Electric Co Ltd is a fine-pitch board-to-board receptacle in the DF40 series, designed for compact electronic assemblies that need reliable interconnect density in limited space. With 20 positions, 0.40 mm pitch, dual-row configuration, SMT mounting, and a 2 mm mated stacking height, it fits space-constrained applications such as handheld devices, industrial control modules, communication equipment, and embedded systems. Engineers typically choose this series when low-profile interconnect performance, gold contact finish, and automated assembly compatibility are important design priorities. Based on the provided data, the lifecycle status is currently unknown, so teams should confirm current manufacturer support before committing it into new long-life programs. RoHS compliance information is not explicitly provided in the specifications, so compliance status should be treated as information not available until verified through official Hirose documentation or manufacturer-backed distributor records. For procurement, tape-and-reel packaging and a standard package of 1,000 support volume production planning.