20-Circuit Vertical Header at 4.20 mm Pitch
The 0039299207: This is a 20-position, dual-row vertical header from the Molex Mini-Fit Jr 5566 series. The through-hole solder tails with board lock anchor the header during wave solder and resist shear from the mated cable assembly.
Board Lock and Through-Hole Termination
The board lock feature is a pair of plastic pegs that snap into the PCB during placement, holding the header in position before soldering. This prevents skew during wave solder and adds mechanical retention against cable strain after the mating connector is latched. The brass square pins are rated for the full Mini-Fit Jr current range; derate above 85 °C ambient per the series derating curve.