DF37B-30DP-0.4V(75) from Hirose Electric Co Ltd is a fine-pitch rectangular board-to-board header designed for compact electronic assemblies where low profile, reliable mating, and SMT compatibility are important. With a 0.40 mm pitch, 30 positions, dual-row layout, gold-plated contacts, and solder retention feature, it fits dense designs such as portable devices, industrial control modules, embedded systems, and compact communication hardware. Engineers typically select parts in this connector class when board stacking height, signal density, and assembly consistency matter. Based on the provided status, this part is active, which supports use in ongoing production and maintenance planning, although the broader lifecycle field is listed as unknown and should still be confirmed through Hirose documentation. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance should be treated as information not available pending official manufacturer confirmation. For regulated designs, engineers should verify latest RoHS and REACH documentation before release to production.