The 5-825440-0: This is a 100-position, dual-row unshrouded header from the TE AMPMODU Mod II series. The mating finish is gold at 3.90 µinch (0.099 µm) over brass pins — a flash-grade plating that handles moderate mating cycles but won't match the durability of thicker gold in high-cycle or corrosive environments.
Unshrouded push-pull — no polarisation, no wall
With no shroud and a push-pull fastening type, the pins are fully exposed when unmated. This saves z-height and cost but leaves the contacts vulnerable to bending during handling — board-level strain relief or a mating housing with guide features is worth planning.