DF40HC(2.5)-30DS-0.4V(70) from Hirose Electric Co Ltd is a fine-pitch rectangular receptacle connector designed for compact, high-density board-to-board interconnect applications. With 30 positions, dual-row layout, 0.40 mm pitch, SMT mounting, and gold contact finish, it is well suited for space-constrained electronics where reliable signal connection and low-profile assembly are important. Typical use cases include portable devices, industrial control modules, embedded computing hardware, and compact communication equipment. As an Active Hirose part, it fits ongoing production designs, although engineers should still review long-term sourcing plans and monitor market conditions, especially where counterfeit exposure is a concern in open distribution channels. RoHS compliance information is not explicitly provided in the supplied specifications, so environmental compliance should be treated as information not available until verified through the official datasheet, manufacturer declaration, or authorized source documentation. This part is positioned as a practical interconnect option for engineers prioritizing miniaturization, manufacturability, and stable supply.