The 66506-043: The dual-row layout with all positions loaded gives you a 2×8 footprint; the 0.100" row spacing keeps the board routing straightforward for signal or low-power lines.
Shrouded Housing and Keying Slot — Why They Matter on the Line
The keying slot in the housing prevents a reversed or wrong-series connector from seating, which saves rework time on the assembly line.
