DF37NC-16DS-0.4V(51) from Hirose Electric Co Ltd is a compact rectangular board-to-board receptacle designed for dense electronic assemblies that need fine-pitch interconnection and low-profile stacking. With 16 positions, 0.40 mm pitch, dual-row construction, and SMT mounting, it is well suited for portable devices, compact industrial modules, embedded control boards, and other space-constrained PCB designs where signal integrity and mechanical fit are critical. The gold contact finish supports reliable mating performance in repeated assembly environments, while reel packaging fits automated production workflows. Based on the provided status, this part is currently Active, which is favorable for ongoing procurement planning, although the overall lifecycle field is listed as unknown and should still be confirmed through Hirose documentation for long-term programs. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance status should be treated as information not available pending confirmation from the manufacturer datasheet or formal compliance certificate.