DF37NB-16DS-0.4V(51) from Hirose Electric Co Ltd is a fine-pitch rectangular board-to-board receptacle designed for compact, high-density electronic assemblies where space, profile, and interconnect reliability matter. With a 0.40 mm pitch, 16 positions, dual-row layout, SMT mounting, and center strip contacts, it is well suited for portable devices, embedded modules, industrial control boards, compact consumer electronics, and other stacked PCB designs that require low mating height. Features such as gold contact finish and solder retention support stable assembly performance in volume manufacturing. Based on the provided product data, the part status is Active, which is favorable for current production programs, although the broader lifecycle field is listed as unknown and should still be verified through Hirose documentation for long-term planning. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance status should be treated as information not available pending confirmation from the manufacturer or latest datasheet.