The Hirose DF40JC-70DS-0.4V(53) is a 70-position receptacle from the DF40 series, designed as a board-to-board mezzanine interconnect. The 2 mm mated stacking height defines the z-axis clearance between parallel PCBs — a fixed dimension that sets the board spacing for the entire assembly.
Any mismatch in the header's height spec shifts the stack and risks open contacts or mechanical interference.
Contact Plating — Flash Gold Limits Field Reconnection
The contacts carry 2.00 µin of gold over the base metal — a flash plating that provides corrosion protection for the first few mating cycles but wears through quickly under repeated disconnect/reconnect. This connector is designed for a one-time assembly or occasional rework, not for a field-service cable that gets unplugged regularly. For applications needing frequent mating, a thicker gold option in the DF40 family would be the correct choice.
Position Count Comparison — 70 vs 60 vs 90
Within the same DF40JC sub-series, the 70-position DF40JC-70DS-0.4V(53) sits between the 60-position DF40JC-60DS-0.4V(53) and the 90-position DF40JC-90DS-0.4V(53). All three share the identical 0.40 mm pitch, 2 mm stacking height, dual-row layout, and gold flash plating. A 60-position variant leaves ten lines unterminated; a 90-position variant leaves twenty pads unpopulated. No other functional difference exists between these three.
No official second-source cross-reference exists from another manufacturer; the Hirose DF40 series is proprietary in its footprint and stacking height.