The 4-640623-2 is officially obsolete. No last-time-buy date or successor part number is on record from TE Connectivity. For an existing BOM line, this means new builds will need a form-fit-function replacement — likely another MTA-100 receptacle with the same 12 positions and 0.100" pitch, though the color (green) and locking ramp may differ on the substitute.
This is an IDC (insulation displacement) connector — no wire stripping or crimping needed. It accepts both discrete wires and ribbon cable, so a harness shop can use the same connector for point-to-point wiring or multi-conductor ribbon runs. The feed-through feature means the IDC slot passes the wire through the housing, allowing daisy-chain termination along a continuous cable.
It is not a secondary latch or TPA; the ramp is molded into the housing and engages audibly on full mate. For applications that see repeated disconnect cycles, the tin plating (80.0µin) is adequate for a few dozen mates but will wear faster than gold — this is a set-and-forget connector for production harnesses, not a field-service disconnect point.