Board-to-board fit for tight 3-position runs
The 216602-3: The gold mating finish (31.5 µin) on phosphor bronze contacts handles repeated mating cycles better than a tin finish would in a corrosive or field-service environment.
How the 216602-3 compares to the 1376775-3 sibling
Both the 216602-3 and the 1376775-3 are 3-position, single-row, through-hole receptacles with a 0.100" pitch and gold mating finish, but the 1376775-3 uses a black thermoplastic housing and a thinner gold plating (8.00 µin vs 31.5 µin). The thicker gold on the 216602-3 (31.5 µin) gives it a higher mating-cycle budget than the 8.00 µin finish on the 1376775-3, which matters if the board sees frequent reconnections.