DF40HC(4.0)-40DS-0.4V(70) from Hirose Electric Co Ltd is a fine-pitch DF40 series rectangular receptacle designed for compact board-to-board interconnect applications where space, height, and signal density matter. With 40 positions, 0.40 mm pitch, dual-row layout, and 4 mm mated stacking height, it is well suited for portable electronics, industrial control modules, embedded computing, display assemblies, and other densely packed PCB designs. Engineers typically choose this connector family for reliable high-density interconnection in low-profile SMD assemblies. Based on the supplied data, market supply is currently balanced, but lifecycle status is officially unknown and an estimated EOL date of 2027 suggests designers should review long-term availability before committing to new programs. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance should be treated as information not available until confirmed through the official datasheet, manufacturer documentation, or distributor compliance records.