DF37B-10DP-0.4V(51) from Hirose Electric Co Ltd is a fine-pitch rectangular connector header designed for compact board-to-board interconnect applications where space, height, and signal integrity are critical. With a 0.40 mm pitch, 10 positions, dual-row layout, SMT mounting, and low 0.75 mm profile above board, it is well suited for portable electronics, compact industrial modules, embedded control boards, and other high-density assemblies. Gold-plated contacts and a solder-retention feature support reliable assembly and stable mating performance in miniaturized designs. Based on the provided data, the part is listed as Active, which is generally favorable for ongoing production planning, although engineers should still confirm long-term availability directly with the manufacturer or authorized channel. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance status should be treated as information not available until verified through Hirose documentation, datasheets, or supplier compliance records.