0.40mm Pitch Mezzanine Receptacle, 40 Positions, 1.5mm Stack Height
The Hirose DF40TC-40DS-0.4V(51) is a 40-position receptacle with center strip contacts from the DF40T series, designed for board-to-board mezzanine stacking at a 1.5mm mated height. The 0.016" (0.40mm) pitch packs 40 circuits into a compact footprint, making it a fit for dense handheld or portable device PCBs where z-height is tight.
Board Layout Fit: Pitch, Positions, and Stack Height
The three numbers that decide the board fit are the 0.40mm pitch, the 40 positions, and the 1.5mm mated stacking height. The pitch sets the pad spacing on the PCB — a 0.40mm pitch footprint is tight, so the board layout must route traces between pads with controlled impedance if the signal speed demands it. The 1.5mm stack height is the distance between the two PCBs when mated — this is the z-height budget the enclosure must allow. The 0.057" (1.45mm) height above board is the receptacle's own profile before mating; the plug adds its own height to reach the total stack.
Mating Plug and Assembly
The two parts together achieve the 1.5mm mated stack height. The receptacle's solder retention pads and pick-and-place surface are designed for reflow assembly; the plug side typically uses similar SMT termination. Confirm the specific plug order code (e.g., DF40TC-40DP-0.4V) matches the position count and pitch before committing the pair to the BOM.
The DF40TC-40DS-0.4V(51) carries an active product status — no end-of-life notice or last-time-buy on record.