DF40C-30DP-0.4V(58) from Hirose Electric Co Ltd is a fine-pitch board-to-board mezzanine connector designed for compact electronic assemblies where space, alignment, and reliable interconnect performance matter. As a 30-position, 2-row surface-mount plug with outer shroud contacts and gold contact finish, it is well suited for densely packed consumer devices, portable medical equipment, industrial control modules, embedded computing platforms, and communication hardware. The 0.40 mm pitch and multiple supported mated stacking heights make it useful for designs that need vertical board spacing flexibility without moving to larger connector systems. Solder retention supports assembly robustness in automated manufacturing environments. Based on the provided specifications, this product is listed as Active, which is generally favorable for new and existing designs. RoHS compliance information is not explicitly provided in the supplied data, so compliance status should be treated as information not available until verified through the manufacturer datasheet, declaration, or authorized distributor documentation.