Series and what this member is
The Molex 430450419 is the 4-circuit member of the Micro-Fit 3.0 43045 series — a dual-row, 3.00 mm pitch header designed for board-to-cable power interconnects in harness assemblies. The shrouded four-wall housing with a locking ramp keeps the mating half seated under vibration, which is the primary reason this series shows up in automotive and industrial control modules rather than low-density consumer boards.
What the ratings mean for your BOM line
At 8 A per circuit this is a power-rated connector, not a signal-density play — the 3.00 mm pitch sets the board footprint and the 9.91 mm insulation height governs the mated stack clearance above the board surface. The split plating is the detail that trips up buyers: gold on the mating interface (15.0 µin / 0.38 µm, +) gives the cycle life this connector needs for field serviceability, while the tin post finish (100.0 µin / 2.54 µm, +) is optimized for solder wetting during SMT reflow rather than repeat mating. Rated 600 V — check your creepage distances at the board layout stage rather than assuming the connector footprint is the only constraint at that voltage.
Compliance and thermal envelope
ROHS3 compliant covers the EU commercial stream. The housing is glass-filled liquid crystal polymer rated UL94 V-0 — that flammability class matters for enclosed equipment in medical and transportation enclosures where a burning connector filament would be a certification problem, not just a reliability one. Operating range spans -40°C to 105°C, wide enough for under-hood automotive modules without needing a derated selection.