Board-to-Cable Fit: 34 Circuits, 2.54mm Pitch
The 66506-019LF: The 0.230" (5.84mm) mating pin length gives good wipe depth for the receptacle contacts, and the 0.105" (2.67mm) solder post length suits standard 1.6mm-thick PCBs. The keying slot prevents mismating with non-keyed receptacles — a useful feature when multiple similar headers sit on the same board.
