What it is
The Molex 430452219 is the 22-circuit member of the Micro-Fit 3.0 43045 series — a dual-row, 3.00 mm pitch header built for board-to-cable power interconnects in automotive, industrial, and medical applications. The header terminates via surface mount and ships in Tape & Reel or Cut Tape. The primary latch is a locking ramp; all four walls are shrouded, which prevents mis-mate and gives the housing a self-contained keying envelope.
Plating split and what it means for your circuit
Contact finish breaks at the interface: gold on the mating side is 15.0 µin (0.38 µm), and tin on the solder post is 100.0 µin (2.54 µm). The gold mating finish carries the 8 A per circuit current rating and supports the reconnection cycles the series is specified for. The heavy tin plate on the post side is sized for solderability and long-term board-level contact stability — not for mating cycles, which happen at the receptacle interface. If your application is permanently mated after first assembly, the tin post is fully adequate; if the assembly will see repeated field reconnects, confirm the mating receptacle's contact plating matches the 8 A rating.
Ratings for the BOM check
Voltage is rated 600 V, which covers most harness-level power distribution up to that ceiling — the pitch and circuit count are what drive the board footprint. The insulation height is 0.390 inches (9.91 mm), and the housing material is glass-filled Liquid Crystal Polymer rated UL94 V-0. The operating window of -40 °C to 105 °C is broad enough for under-hood and industrial enclosure environments.