3.5 mm stack height, 40 positions, 0.50 mm pitch
The DF12D(3.5)-40DP-0.5V(81): This is a 40-position, 2-row header from the Hirose DF12 series, pitched at 0.50 mm and designed for a mated stacking height of 3.5 mm. Gold-plated contacts suit moderate mating-cycle duty in instrumentation or telecom line cards where the board stack is fixed after assembly.
Obsolete — plan the BOM transition
The DF12 series includes other stacking-height variants and position counts; a pin-compatible alternative within the same family may be available — confirm the footprint and stack height against the board layout before substituting.
RoHS and REACH compliance documentation is provided by Hirose for this series; no UL or IEC listing exists for this specific order code.