DF40GB-10DP-0.4V(51) from Hirose Electric Co Ltd is a compact board-to-board mezzanine connector designed for dense electronic assemblies where space, profile, and connection reliability matter. As a 10-position, 0.40 mm pitch plug with outer shroud contacts, surface-mount termination, and shielded construction, it is well suited for portable devices, compact industrial modules, embedded control boards, and other multilayer PCB designs that require secure interconnects at a 1.5 mm stacking height. Gold contact finish and solder retention features support dependable mating performance in high-density applications. Within the Connectors, Interconnects > Rectangular - Board to Board Connectors - Arrays, Edge Type, Mezzanine category, this part fits designs that prioritize miniature packaging and precise board stacking. Lifecycle status is currently listed as unknown, so engineers should confirm long-term availability with the manufacturer or authorized sources before committing to new production. RoHS compliance information is not available in the provided data, and compliance should be verified through official Hirose documentation before use in regulated markets.