Board-to-Wire Header, 12 Circuits, 4.20 mm Pitch
The 0039290123: This is a Molex Mini-Fit Jr 5566 series header — 12 circuits in a dual-row arrangement, 4.20 mm pitch between contacts.
Gold-Plated Mating Interface, Tin Post
Gold on the mating face, tin on the post: a common split that keeps the high-cycle interface corrosion-resistant while the solder joint uses a cost-effective finish.
This header mates with Mini-Fit Jr 5557 receptacle housings (e.g., 39-01-2125 for 12 circuits) using 44476-series crimp terminals for 18–24 AWG wire.