What it is and where it sits in the series
The Molex 430452417 is the 24-circuit member of the Micro-Fit 3.0 43045 series — a dual-row, 3.00mm pitch header designed for board-to-cable wire-drop applications in automotive, industrial, medical, and telecom harness assemblies. The header carries a 4-wall shroud and a locking ramp that mates with the matching Micro-Fit 3.0 plug housing to deliver positive retention under vibration. Surface-mount termination with a board-lock feature anchors the part during reflow — the locking ears bite into the PCB pad and reduce header drift before the solder joint is fully set.
What the key ratings mean for the fit
At 8 A per contact, the 430452417 handles power-drop and signal circuits within the same 24-position shell — the dual-beam Micro-Fit contact geometry maintains resistance below spec across the full current rating. The 600V voltage ceiling is well above typical automotive and industrial secondary-circuit levels, so voltage is not the limiting factor for most harness designs. The board layout constraint is the 0.390" (9.91 mm) insulation height — verify this against the z-height budget in the enclosure before committing to the footprint. The plating split matters. The mating face carries 30.0µin (0.76µm) gold over the full 24 positions, which governs cycle life against the matching receptacle's tin-plated contact — this is a tin-on-gold interface, and the gold thickness on the 430452417 is what sets the reconnection durability. The solder tail is 100.0µin (2.54µm) tin — heavier tin on the post side improves solderability and wetting margin during SMT reflow, but does not add cycle life to the mating interface. Read those two figures as two separate decisions: one about how many mate/unmate cycles the connector is rated for, and one about how reliably it solders to the board.
Mating half and termination
The 430452417 is the board-mount half — it mates with the matching Micro-Fit 3.0 plug housing and the crimp terminal designed for that housing (the terminals accept discrete wire in the gauge range compatible with the series). Confirm the plug housing polarity and TPA (Terminal Position Assurance) feature matches the harness specification before quoting both halves into the BOM. Termination is SMT solder — the recommended footprint is the series-standard pattern; check the land pattern drawing for coplanarity and heel-fillet requirements on the dual-row layout.