What This Connector Is
The Molex 0430450427 is a 4-circuit, dual-row header from the Micro-Fit 3.0 43045 series. It is a board-to-cable/wire interconnect, meaning it mounts on a PCB and mates with a receptacle housing crimped to discrete wires. The 3.00 mm pitch and matching row spacing give a compact but serviceable footprint for power and signal distribution in automotive, industrial, medical, and telecom equipment.
Key Features and What They Mean for Your Build
Rated 8 A per circuit with a 600 V voltage rating, this header carries enough current for a moderate power rail or a bundle of signal lines. The 8 A figure is per-contact at the rated temperature rise — derate above 25 °C per the product drawing. The tin-plated contacts (60.0 µin on the mating side) are suited for applications with a limited number of mating cycles; if your design requires frequent disconnect/reconnect, a gold-plated variant in the same series would be the better call. The 4-wall shrouding protects the male pins from bending during handling and prevents a mis-mated connection. A locking ramp on the header engages with the matching receptacle latch, giving positive retention in vibration-prone environments like an engine bay or an industrial cabinet. The through-hole solder termination provides a robust mechanical anchor to the PCB, and the board guide feature helps align the connector during automated assembly. The housing is molded from glass-filled LCP with a UL94 V-0 flammability rating, so it meets the flame-retardant requirement for equipment inside an enclosure. The black insulation colour is standard for the series.
Where It Fits in the Series
The 0430450427 is the 4-circuit, dual-row member of the Micro-Fit 3.0 43045 header family. Against the 2-circuit single-row sibling (0430450201), this part gives you two rows at the same 3.00 mm pitch — useful when you need four positions but want to keep the board footprint narrower than a single-row 4-position part. The dual-row layout also provides a natural keying against mis-mating with a single-row receptacle.