The 2182160420: This is a 4-position, dual-row surface-mount header from the Molex Micro-Fit+ 218216 series. The 3.00 mm pitch sets the board footprint and the per-contact current ceiling — at the listed 600 VAC/DC rating, the pitch keeps creepage and clearance in check for signal-level power.
Sizing the PCB footprint and routing
The insulation height of 0.390 inches (9.91 mm) means the mated stack height leaves room for component clearance on the board — important for tight enclosures.
ROHS3 compliant, UL94 V-0 rated housing.