The yellow housing colour is a visual key for the 6-position variant on the assembly line, reducing the chance of loading the wrong receptacle into a harness fixture. The polarizing key and feed-through feature let multiple receptacles share the same wire run without orientation errors — the key aligns to the header slot, and the feed-through passes the wire through the housing to the next position.
Termination and wire preparation for the IDC slot
The IDC termination is sized for 20 AWG only — no range, no guesswork. The insulation displacement slot cuts through the insulation and cold-welds to the conductor on insertion. For discrete wire, the conductor must be round, solid or stranded, with an insulation diameter that matches the slot entry; for ribbon cable, the 0.156" pitch aligns with standard 0.156" centerline ribbon.
The base product number 644466 covers the MTA-156 receptacle family; the full 3-644466-6 suffix specifies the 6-position, yellow, tin-plated variant in bulk packaging.