DF37NB-20DS-0.4V(75) from Hirose Electric Co Ltd is a fine-pitch rectangular board-to-board receptacle designed for compact electronic assemblies where vertical space and connection density are critical. With 20 positions, 0.40 mm pitch, dual-row construction, and SMT mounting, it fits applications such as mobile devices, wearable electronics, compact industrial modules, medical handhelds, and embedded control boards. Gold-plated contacts and a solder-retention feature support reliable interconnect performance during assembly and use. This part is positioned for designs that need a low-profile stacking connector with established Hirose manufacturing quality. The provided status indicates Active, which is favorable for ongoing procurement, although lifecycle verification from the manufacturer is still recommended because the separate lifecycle field is listed as unknown. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance should be treated as information not available until confirmed through the official datasheet, manufacturer declaration, or authorized distributor documentation.