DF37NB-10DS-0.4V(51) from Hirose Electric Co Ltd is a compact rectangular receptacle connector designed for high-density board-to-board interconnect applications where space, profile, and reliable contact performance matter. With a fine 0.40 mm pitch, 10 positions, dual-row layout, and low mated stacking height, it is well suited for portable electronics, compact industrial modules, display assemblies, wearable devices, and other miniaturized embedded systems. Gold-plated contacts and a solder-retention feature support dependable assembly and signal integrity in space-constrained SMT designs. Based on the provided status, this part is listed as Active, which is favorable for ongoing procurement, although the separate lifecycle field is marked unknown, so engineers should still verify current manufacturer lifecycle data before locking it into long-term programs. RoHS compliance information is not provided in the supplied specifications, so compliance status should be treated as information not available until confirmed through the official datasheet, manufacturer declaration, or authorized distributor documentation.