What this connector is
The Molex 430451826 is the 18-circuit member of the Micro-Fit 3.0 43045 series — a dual-row board-to-cable header with a 3.00 mm pitch and a fully shrouded 4-wall body that carries a locking ramp on the header rail. The header mates with the matching Micro-Fit 3.0 plug housing, and the kinked pin through-hole termination anchors it in the PCB during wave or hand-solder assembly. All 18 positions are populated; the contacts are brass with gold plating on the mating face (30.0 µin / 0.76 µm) and tin on the solder post (100.0 µin / 2.54 µm), which gives gold's wipe durability at the interface while keeping the post solderable.
Ratings that drive the fit decision
The 8 A per-circuit current rating at 600 V puts this squarely in power-distribution territory — the 3.00 mm pitch is compact but the current density is well above signal-header levels, so do not size the wire or the PCB trace on a signal-header assumption. The gold thickness on the mating interface (0.76 µm) supports the higher mating cycle demand that power interconnects see in industrial and automotive harness environments; the tin post is the right choice for solder-side durability. The 105 °C upper operating limit covers most sealed-chassis and under-hood ambient conditions, and the board-lock features on the housing reduce lateral shift during mating — important at 18 positions where the engagement force is non-trivial.
Where it is used
Micro-Fit 3.0 is the go-to mid-density power header for automotive control modules, industrial automation nodes, medical instrumentation, and telecom infrastructure — anywhere a board needs to accept a harness plug at 8 A per circuit in a 3.00 mm pitch footprint. The shrouded 4-wall body keeps the contacts protected during handling and in production fixtures, and the locking ramp prevents accidental disengagement in vibration environments. The UL94 V-0 LCP insulator handles the thermal and flame-retardance requirements in those same applications.
Lifecycle and sourcing posture
The 430451826 carries an Active lifecycle status and is ROHS3 Compliant — it is in normal production and sourced against BOM quantity by RFQ. There is no official successor or cross-reference listed for this part number. The pitch, position count, and plating match the series standard, so the selection check is confirming the 18-circuit count against your harness position count and verifying the mating plug housing from the same series is specified on the opposite end of the cable segment.