What this connector is
The Molex 430452229 is the 22-circuit member of the Micro-Fit 3.0 43045 series — a dual-row, 3.00 mm pitch male header designed for board-to-cable power and signal distribution in demanding environments. The connector mates with the matching Micro-Fit 3.0 female receptacle housing, which accepts individual crimp terminals terminated to the wire harness. The header carries square male pins housed in a 4-wall shroud that provides both mechanical protection and polarity keying to prevent mis-mating in production or field service. A locking ramp on the shroud adds retention under vibration — the kind of detail that matters in automotive under-hood or industrial equipment harnesses where vibration can work a friction-fit header loose over time.
Plating and what it means for the application
The contact finish splits across the two functional zones: gold at 30.0 µin (0.76 µm) on the mating face and tin at 100.0 µin (2.54 µm) on the solder tail. The gold on the mating interface gives the cycling durability and fretting resistance that high-mate applications demand, while the thick tin on the post ensures a reliable, wettable solder joint during board assembly. The contact material is brass throughout. This plating architecture is the key differentiator against tin-only alternatives in the same series — the gold layer is not decorative, it is what keeps the connector performing across repeated mating cycles without the contact resistance climbing.
Current and voltage ratings
Rated 8 A per circuit at the mating interface. The 600 V voltage rating places this connector well above typical signal-level duties — it has genuine headroom for power distribution roles in industrial controls, lighting, and auxiliary automotive circuits. The 8 A per-circuit rating is governed by the contact cross-section and plating; at that current level the temperature rise at the interface stays within the LCP housing's UL94 V-0 thermal ceiling across the -40 °C to 105 °C operating window.
Board-level fit and termination
The 430452229 is a through-hole solder header with a 0.125-inch (3.18 mm) pin length and 0.390-inch (9.91 mm) insulation height above the board surface. The square pin shape seats reliably in the plated through-hole during wave or hand soldering. The board guide feature on the housing assists alignment during placement and keeps the header seated squarely during the reflow or wave process — particularly helpful on dense boards where pick-and-place accuracy is tested. The two rows are spaced 0.118 inches (3.00 mm) apart, consistent with the mating pitch, so the entire footprint is a square grid at 3.00 mm.
Environments and applications
The rated operating range of -40 °C to 105 °C and the UL94 V-0 flammability rating place this connector squarely in automotive, industrial, and medical equipment applications where thermal cycling and flame retardancy are specified requirements. The 4-wall shrouding and locking ramp together make it suited for harnesses subject to vibration — the shroud prevents side-loading on the pins and the locking ramp resists withdrawal under pull. It ships fully loaded (all 22 positions populated) in a tray package.
Sourcing and lifecycle
The 430452229 carries an Active product status and is ROHS3 Compliant. No official successor or cross-reference order code is listed. For BOM sourcing the primary checks are: confirm the 22-position circuit count matches the harness position count, confirm the mating Micro-Fit 3.0 receptacle housing and crimp terminal are specified on the wire side of the interconnect, and verify the through-hole footprint is correct for the board stack-up. Quoted to order against the BOM quantity — sourced per RFQ.