The 5-146256-6: This is a 12-position, dual-row breakaway header from the AMPMODU Mod II series, pitched at 0.100" (2.54mm) — the standard grid for legacy and industrial board layouts.
Gold on the mating side (15 µin) versus tin on the post (100 µin) is a classic signal-grade split: the gold preserves contact resistance through 50+ mating cycles, while the tin post solders reliably into plated through-holes.
