What this header is and where it sits in the series
The Molex 430451427 is the 14-circuit member of the Micro-Fit 3.0 43045 series — a dual-row, 3.00 mm pitch header designed for board-to-cable power and signal distribution in harness assemblies. The header mates with the matching Micro-Fit 3.0 receptacle housing and accepts pre-crimped wire terminals on the cable side. Shrouding on all four walls, a locking ramp on the tails, and a board-guide feature make it suited for blind-mate conditions and vibration-prone environments.
Voltage and current — the ratings that govern fit
Construction and what the features mean in the field
Four-wall shrouding is the primary mis-mate guard — it gates the pin array and prevents incorrect orientation or cross-mating with the wrong housing. The locking ramp on the tail section is a positive-latch feature that requires deliberate actuation to unmate, so the pair holds under vibration without a secondary fastener. The board guide ribs on the housing lead-in help alignment during blind-mate assembly — useful when the board-to-wire connection is behind a panel or in a dense routing zone. The housing material is glass-filled liquid crystal polymer rated UL94 V-0, which sets the upper bound on the operating temperature range: -40 to 105 °C. At the high end, LCP maintains its dimensional stability and the locking ramp retains sufficient force to stay latched. At -40 °C the same material is usable in cold-storage or outdoor industrial equipment without a special low-temperature variant. Through-hole solder termination with 0.125 in (3.18 mm) post length gives a solid mechanical joint on FR4 or other standard PCB substrates. The 0.390 in (9.91 mm) insulation height sets the stand-off from the board surface — relevant for cleaning under the header post-solder.
Positions and the same-series peer worth knowing
14 positions is the decision point for this part. The dual-row, 3.00 mm pitch footprint is shared across the Micro-Fit 3.0 43045 series — the number of populated circuits and matching housing size vary by BOM requirement.