Micro-Fit 3.0 10-Circuit Dual-Row Header
The Molex 430451029 is the 10-position member of the Micro-Fit 3.0 43045 series — a dual-row, board-to-cable header with a 0.118 inch (3.00 mm) pitch and a 4-wall shroud that guides the mating receptacle and guards against mis-mate. The locking ramp on the housing independently confirms engagement before the user trusts the connection, a detail that matters in any harness that sees vibration or thermal cycling. Gold plating at the mating interface (30.0 µin / 0.76 µm) resists fretting and sustains repeated mating cycles, while the tin-plated solder posts (100.0 µin / 2.54 µm) give a robust solder fillet and oxidation resistance at the board joint. Rated 8 A per circuit and 600 V, it sits in the sweet spot between signal-level Micro-Fit 3.0 variants and the full-power members of the same family — the 8 A headline is per-contact, which is what the board layout engineer needs to know before routing the circuit. Insulation is black liquid crystal polymer, glass-filled, rated UL94 V-0. The board guide feature on the housing aligns the header to the PCB during assembly so the through-hole leads seat cleanly without drift. Mating side insulation height is 0.390 inch (9.91 mm) — the board layout engineer accounts for this in the keep-out zone under the connector. Contact length beyond the board is 0.125 inch (3.18 mm), which governs paste throat depth and the profile of the solder fillet.
Applications and Environments
The listed applications — automotive, general purpose, industrial, medical, and telecommunications — span sealed and unsealed environments; the Micro-Fit 3.0 series is broadly used inside equipment enclosures and harness panels where vibration, thermal cycling, and repeated mating are the operational realities. The gold-plated mating interface and locking ramp make this a reasonable choice for any harness segment that gets serviced — the contact finish sustains the cycles a field-replacement or debug scenario demands. As a board-to-cable connector, it is the fixed half of the interconnect: the header lives on the PCB or panel, and the matching receptacle housing with its crimp terminals terminates the wire harness.