Sizing the board footprint for an 8-position wire-to-board run
The 3-644615-8: The 8-position, single-row MTA-156 header mates with a matching receptacle housing carrying crimped terminals — the 0.156" (3.96mm) pitch sets the board pad spacing and the wire-to-wire pitch in the harness.
Wiring and mating checklist
The shrouded 1-wall design and keying slot guide the mating housing into correct orientation, reducing the chance of a mis-mate during assembly. Board guide features on the header align the PCB during insertion into the mating connector, protecting the solder joints from shear stress.