DF37NB-44DS-0.4V(53) from Hirose Electric Co Ltd is a fine-pitch rectangular mezzanine connector designed for compact board-to-board interconnect applications where height, density, and assembly reliability matter. As part of the DF37 series, this 44-position, 0.40 mm pitch receptacle is well suited for portable electronics, embedded control boards, communication modules, medical devices, and other space-constrained OEM designs that require low-profile SMT connectivity. Features such as gold contact finish and solder retention support stable electrical performance and automated assembly processes. Based on the provided data, it is supplied in tape-and-reel packaging for volume manufacturing and carries MSL 1 handling characteristics. Lifecycle status is currently listed as unknown, so engineers and procurement teams should verify current production status directly with Hirose or an authorized source before committing to new designs. RoHS compliance information is not explicitly provided in the supplied specifications, so compliance should be confirmed through official manufacturer documentation.