What this Economy Power header does
The 1744109-4 is a 9-position (8 loaded) board-to-cable/wire header from TE's Economy Power series, on a 0.156" (3.96mm) pitch. The single-wall shroud and friction lock keep the mating half aligned and latched under vibration.
Pitch, position count, and why 8 loaded matters
The 3.96mm pitch is a standard for wire-to-board power distribution — wide enough to route traces between pads on a single-layer board without necking down. The 9-position housing carries 8 loaded contacts; position 9 is a keying or polarization slot, not a missing circuit. Verify your BOM calls for 8 active circuits, not 9.