The 77311-118-20LF: The 0.100" pitch sets the PCB drill pattern and the mating receptacle pitch — any standard 0.100" unshrouded socket or female header with matching position count will mate. With 20 positions loaded in a single row, the header occupies about 2.0 inches of board edge.
Within the same BERGSTIK base product number 77311, the 20-position variant (77311-118-20LF) differs from the 16-position (77311-118-16LF) only in position count — all other specs (pitch, current, plating, material, lifecycle) are identical.
