20-Position Board-to-Board Plug at 1.27 mm Pitch
The Hirose FX2CA2-20P-1.27DSA(71) is a 20-position board-to-board plug from the FX2 series, designed for parallel board stacking with a 1.27 mm pitch. The gold-plated contacts, at 7.87 µin (0.200 µm) thickness, provide a reliable interconnect for signal-level duty in controlled environments like telecom or industrial control boards. This is the basic through-hole version without board locks — a clean fit for designs where the plug is captured by the mating receptacle and the solder joints alone handle retention.
Gold over nickel prevents corrosion at the contact interface, so the contact resistance stays stable across the life of the stack. The per-contact current rating is not listed in the spec, but the 1.27 mm pitch and center strip geometry typically keep each contact in the 0.5 A to 1 A range for signal paths; this plug is meant for data and control lines, not the power rail.
The 1.27 mm pitch and dual-row layout give a 20-position footprint that is compact without being dense enough to force blind vias — a standard two-layer board can route the traces between the through-hole pads. The center strip contact style means the signal path is a straight beam-on-pad interface, which keeps the inductance low for digital signals up to a few hundred MHz.