The 640455-8: It mates with standard MTA-100 IDC receptacles for board-to-cable/wire applications. The single-wall shroud provides basic keying to prevent reverse insertion, though it offers less polarization than a full 4-wall shroud found on some sibling headers.
Tin Contacts and Current Derating
Derate per the application note in the product drawing. The contact length – mating is 0.295" (7.49 mm), and the post length is 0.140" (3.56 mm).
It is ROHS3 compliant.
The CT header offers a finer pitch for denser boards and better polarization, but it is an 11-position part, not an 8-position, so a board layout change is required.