Comparing to 1376779-2: Gold Thickness and Package
The closest functional peer is 1376779-2, also a 2-position AMPMODU Mod II header with gold mating finish, but with a thinner 8.00µin gold layer versus the 15.0µin on 5-146256-1 — a meaningful difference for applications requiring higher mating cycle life. Both are active and through-hole; 5-146256-1 ships in bulk, while 1376779-2 comes in a box — a packaging consideration for automated assembly lines.
Termination is solder to through-hole; the 0.120" post length and 0.440" overall contact length suit standard 0.062" to 0.093" PCBs with typical wave-solder profiles.