The 20021311-00012T4LF: The mating contact finish is 10µinch gold over phosphor bronze — a standard flash plating that handles repeated mating in a controlled environment. The solder tails are tin-plated (100µinch), which wets well during wave soldering and provides a reliable intermetallic bond with the PCB pad.
Peer Comparison: 10, 14, and 16 Positions
The 20021311 family shares identical pitch, plating, and housing material. The 12-position version sits between the 10-position (20021311-00010T4LF) and the 14-position (20021311-00014T4LF) — the only difference is the number of circuits, which changes the connector body length. For a BOM that calls for 12 circuits, this is the exact fit; the 14-position sibling would leave two unloaded positions, which is mechanically acceptable but wastes board space.