DF40B(2.0)-12DS-0.4V(58) from Hirose Electric Co Ltd is a surface-mount rectangular connector receptacle in the DF40 family, designed for compact board-to-board interconnect applications where high-density packaging and reliable contact performance are important. With 12 positions, center strip contacts, gold contact finish, and tape-and-reel packaging, it is well suited for automated assembly in portable electronics, embedded control boards, industrial modules, and space-constrained communication devices. Engineers typically choose this series when they need a low-profile interconnect from a recognized connector manufacturer with broad industry usage. Based on the provided data, this part shows balanced supply-demand conditions, high market popularity, and an estimated production lead time of 25 weeks, which makes planning advisable for ongoing programs. Lifecycle status is currently listed as unknown, so design teams should confirm product status directly with Hirose before committing to long-term production. RoHS compliance information is not available in the provided specifications and should be verified through the official datasheet or manufacturer compliance documentation.