The Hirose FX2-100P-1.27DS(71) is a 100-position board-to-board plug from the FX2 series, built with center strip contacts arranged in two rows. It terminates through-hole, right-angle — meaning it sits perpendicular to the PCB at the board edge, suited for mezzanine or parallel-board stacking where the plug and its receptacle bridge two parallel planes.
At 100 circuits, this plug matches high-density backplane or mezzanine signal runs — think a full-width data bus plus control lines on a single connector. The right-angle through-hole termination anchors the plug mechanically into the board, handling insertion and extraction forces from the mating receptacle better than a surface-mount part would. That matters when the connector sees repeated mate/unmate during test or rework. If your application needs thousands of cycles, step up to a heavier gold option in the FX2 series.
The FX2-100P-1.27DSL(71) is the closest functional sibling — same 100 positions, same right-angle through-hole footprint, same gold plating thickness. The difference: the 'L' variant adds a board lock feature for extra SMT reflow retention or vibration resistance. If your assembly line has pick-and-place and reflow, the board lock helps keep the plug seated during wave solder. The FX2-100P-1.27SV(71) is a surface-mount version of the same 100-position plug — no right-angle, no through-hole anchors, so it saves board space but relies entirely on solder for mechanical retention. For a lower circuit count, the FX2B-68PA-1.27DS(71) shares the same 1.27 mm pitch, right-angle through-hole format, and gold plating, but at 68 positions.