DF40GB(1.5)-48DS-0.4V(58) from Hirose Electric Co Ltd is a fine-pitch board-to-board mezzanine receptacle designed for compact electronic assemblies where space, alignment, and reliable interconnection are critical. With a 0.40 mm pitch, 48 positions, dual-row layout, surface-mount termination, and 1.5 mm mated stacking height, it fits densely integrated designs such as portable devices, industrial control modules, embedded computing boards, and communication equipment. Gold contact finish supports stable signal transfer, while shielded construction and solder retention features add mechanical confidence in high-density PCB layouts. Within the Connectors, Interconnects > Rectangular - Board to Board Connectors - Arrays, Edge Type, Mezzanine category, this part is positioned for engineers seeking low-profile interconnect performance in space-constrained systems. Lifecycle status is currently information not available, so teams should verify long-term availability with Hirose or authorized distribution before locking it into new programs. RoHS compliance information is also not available in the provided data and should be confirmed through official manufacturer documentation.