The Hirose DF40GL-44DP-0.4V(51) is a 44-position shielded header from the DF40GL series, designed for board-to-board mezzanine connections where board space is tight and signal integrity matters. The mated stacking height is 1.5mm, which sets the gap between parallel PCBs in a compact assembly. At 0.40mm pitch, the footprint demands careful PCB routing — trace widths and via keepouts need to be planned for the tight pad spacing. This is a production-current part — active lifecycle, RoHS compliant, and available through the independent channel against an RFQ.
What crosses to it when the original is dry?
The closest functional peer is the DF40GL-44DP-0.4V(58), which shares the exact same 44-position count, 0.016" (0.40mm) pitch, 1.5mm stacking height, gold plating, and shielded SMT construction. Mechanically and electrically they are identical, so a board laid out for one accepts the other without any footprint or clearance change. The mating receptacle is the DF40GL-44DS-0.4V(58), also a 44-position, 0.40mm pitch, gold-plated part with center strip contacts. That's the half you pair with this header to complete the board-to-board link.