The Hirose DF40TC(3.0)-30DS-0.4V(51) is a 30-position receptacle with center strip contacts from the DF40T series, designed for board-to-board mezzanine stacking at a 3 mm mated height. Gold plating on the contacts (1.97 µin) suits repeated mating cycles in field-serviceable assemblies, while the pick-and-place feature and solder retention pads support automated SMT lines without secondary handling.
Stacking Height and Board Fit
At 0.40 mm pitch, the trace escape from the inner rows requires micro-vias or blind vias in the board stack-up — a standard through-hole via at this pitch would short adjacent pads. The 2.90 mm height above board on the receptacle side means the mating plug contributes the remaining stack-up to reach the 3 mm total. If your design calls for a different mezzanine gap, this member of the DF40T series is fixed at 3 mm; other DF40T variants offer alternative stacking heights.