DF37NB-50DS-0.4V(51) from Hirose Electric Co Ltd is a fine-pitch rectangular board-to-board receptacle designed for compact electronic assemblies where low profile and reliable interconnect performance matter. With 50 positions, 0.40 mm pitch, two rows, gold contact finish, and SMT mounting, it fits dense PCB layouts used in portable devices, embedded control boards, industrial modules, and other space-constrained systems. The connector’s solder retention feature adds assembly stability, which is valuable in automated manufacturing and high-density designs. Based on the provided data, the manufacturer status is Active, which supports ongoing design consideration, although the separate lifecycle field is listed as unknown and should still be verified through current manufacturer documentation. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance status should be treated as information not available until confirmed by the official datasheet, manufacturer declaration, or distributor compliance documentation.