DF40HC(3.5)-60DS-0.4V(58) from Hirose Electric Co Ltd is a fine-pitch board-to-board rectangular connector designed for compact electronic assemblies that need reliable mezzanine interconnection in limited space. As part of the DF40 series, this 60-position, 0.40 mm pitch surface-mount receptacle is well suited for industrial electronics, portable devices, embedded control boards, communication modules, and other high-density PCB stacking applications where low profile and consistent mating performance matter. Engineers typically select this type of connector to support dense layouts, controlled stacking height, and efficient automated assembly using tape-and-reel packaging. The supplied product status indicates Active, which is generally favorable for ongoing designs, although lifecycle status should still be confirmed directly with Hirose for production planning. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance status should be treated as information not available pending datasheet or manufacturer confirmation. For regulated programs, teams should also verify REACH and material declaration documents before release.