DF37NC-30DS-0.4V(51) from Hirose Electric Co Ltd is a fine-pitch rectangular receptacle connector designed for compact board-to-board interconnect applications where low profile and reliable contact performance are important. With a 0.40 mm pitch, 30 positions, dual-row layout, and SMT mounting format, it fits space-constrained portable, industrial, and embedded electronic designs such as handheld devices, display modules, communication equipment, and compact control boards. Engineers typically choose this series when they need high-density interconnection, controlled stacking height, and proven connector performance from an established manufacturer. Based on the provided data, the part status is Active, which is favorable for ongoing procurement, although the overall lifecycle field is listed as unknown and should still be confirmed through official manufacturer sources. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance status is best treated as information not available pending verification from Hirose documentation or authorized distribution records.