The 9-146256-0-09: Unshrouded means the pins stand exposed above the insulator; the mating receptacle aligns by its own housing walls, so board-level keep-out is just the pin footprint plus clearance for the receptacle body. The 0.230-inch (5.84mm) mating pin length gives enough engagement depth for standard AMPMODU socket strips, and the 0.120-inch (3.05mm) solder tail suits a 1.6mm-thick PCB with through-hole wave solder.
Current and Contact Performance
At 3A the rise stays under the UL94 V-0 material limit. 15 µinch gold over nickel on the mating face, with 100 µinch tin on the solder tails.
Series Positioning and Mating Options
The dual-row 18-position count sits between the 16- and 20-position variants in the same series — useful when a BOM calls for exactly 18 signal lines on a 2.54mm grid.