DF40C(2.0)-60DS-0.4V(51) from Hirose Electric Co Ltd is a DF40 series rectangular connector receptacle designed for high-density board-to-board interconnect applications where compact footprint, reliable mating, and surface-mount assembly are important. With 60 positions, center strip contacts, gold contact finish, and tape-and-reel packaging for volume assembly, it fits well in portable electronics, industrial control modules, embedded systems, communication equipment, and other space-constrained designs. Engineers often select this type of connector to support fine-pitch interconnection between stacked PCBs while maintaining manufacturing efficiency. From a sourcing perspective, the part shows balanced supply and demand and high market popularity, but the open-market counterfeit threat is noted as high, so controlled channel procurement is advisable. Lifecycle status is currently listed as unknown, so designers should confirm long-term availability with Hirose or authorized sources before locking it into new programs. RoHS compliance information is not available in the provided data and should be verified through the official datasheet or manufacturer compliance documentation.