DF40C-80DP-0.4V(51) from Hirose Electric Co Ltd is a fine-pitch rectangular board-to-board connector designed for compact, high-density electronic assemblies where space savings and signal integrity are critical. As an 80-position, 0.40 mm pitch plug with outer shroud contacts and SMT mounting, it is well suited for portable devices, industrial control modules, embedded systems, imaging equipment, and other multilayer PCB designs that require reliable interconnect performance in low-profile layouts. Features such as gold contact finish and solder retention support dependable assembly and repeated mating in precision applications. Based on the provided status, this part is active, which supports ongoing design-in and maintenance sourcing. Lifecycle status was separately listed as unknown, so engineers should still confirm current factory lifecycle details through official manufacturer documentation. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance should be treated as information not available pending verification from Hirose datasheets or formal compliance certificates.