The Hirose FX2C2-20S-1.27DSA(71) is a 20-position, 2-row board-to-board receptacle from the FX2 series, on a 1.27 mm pitch. It terminates through-hole with solder, and the outer shroud contacts provide self-alignment during mating — useful when the receptacle sits in a dense board stack where you can't see the pins engage.
The 1.27 mm pitch and 20 positions in 2 rows give a compact footprint that routes well on standard PCB substrates. Through-hole termination means the solder joints take the mechanical load from mating and unmating — the board-side anchor is stronger than an SMT part of the same pitch. The vertical (straight) orientation keeps the receptacle perpendicular to the board, which mates with a matching FX2 series header at a fixed stack height.
Mates with the matching FX2 series header — the outer shroud contacts on this receptacle align with the header's pin field. Termination is through-hole solder; the pins are designed for wave or hand-solder assembly. The receptacle accepts the standard FX2 crimp or press-fit header on the mating side, depending on the header variant selected.