0.40 mm Pitch, 30-Position Receptacle — the DF40T Mezzanine Fit
The Hirose DF40TC(3.5)-30DS-0.4V(58) is a 30-position receptacle from the DF40T series, designed for board-to-board mezzanine stacking at a 3.5 mm mated height. The 0.016" (0.40mm) pitch packs 30 circuits into a compact dual-row footprint, making it a fit for tightly spaced PCBs where every millimetre of board real estate counts.
3.5 mm Stack Height — the Z-Height Budget Is Set
Gold Contacts at 1.97 µin — Signal-Duty Plating
It is not the heavy gold (30+ µin) you spec for frequent field-service reconnects. For signal-level currents in a mezzanine stack, the gold surface prevents oxide formation and maintains contact resistance through the life of the assembly.
Active Production — Standard Sourcing
The lifecycle status is Active with no phase-out or last-time-buy notice on record. RoHS compliant. No cross-reference or second-source is documented; the DF40TC(3.5)-30DS-0.4V(51) is a packaging variant (Digi-Reel vs Cut Tape) rather than a functional alternative.