The 5-103639-4: At 2.54 mm pitch, this header occupies the same board footprint as legacy 0.100" grid connectors, making it a drop-in for existing layouts that need a 5-circuit single-row interface. The 5.84 mm mating contact length provides adequate wipe for reliable tin-to-tin contact under normal insertion depths.
If your BOM calls for 5 positions at 2.54 mm pitch, stick with 5-103639-4; the 6-position sibling requires a board layout change and a different mating receptacle.
