DF40GB(3.0)-48DS-0.4V(58) from Hirose Electric Co Ltd is a fine-pitch board-to-board mezzanine receptacle designed for compact electronic assemblies that need reliable high-density interconnects in limited PCB space. With 48 positions, 0.40 mm pitch, surface-mount termination, shielded construction, and solder-retention features, it fits applications such as portable devices, embedded control boards, industrial modules, communication equipment, and other stacked PCB designs requiring a 3 mm mated height. Engineers typically select this connector family for space-efficient layout, stable mating performance, and premium contact interface with gold finish. Based on the category, this type of connector is commonly used in long-life interconnect architectures, but the specific lifecycle status for this part is listed as unknown, so design teams should verify current manufacturer support before locking it into new programs. RoHS compliance information is not available in the provided data. For regulated products, engineers should confirm RoHS and related material declarations directly with Hirose or the latest official documentation before production release.