This header mounts through-hole with a 0.130" (3.30mm) post length — it sits flush on the board and the solder tails protrude enough for wave solder or hand-solder inspection. The board guide and keying slot on the housing prevent misalignment during assembly and ensure the connector only mates in the correct orientation — a practical safeguard on a production line where operators work by feel.
How this compares to the right-angle sibling 1394090-1
If your design needs a right-angle exit for cable routing against a panel edge, 1394090-1 is the alternative; for vertical board-to-cable or board-to-board stacking, stick with 5-104450-5.