What it is and where it sits in the series
The Molex 430451812 is the 18-circuit dual-row member of the Micro-Fit 3.0 43045 header family — a board-to-cable connector built around a 0.118" (3.00 mm) pitch with a 4-wall shroud and locking ramp for vibration-secure mating. Brass contacts are tin-plated on both the mating face and the solder post at 100.0 µin (2.54 µm), rated 8 A per circuit and 600 V. The kinked through-hole pin retains the header in the PCB during wave solder; the board-guide feature keys alignment during assembly.
What the ratings mean for your fit
The 18-position dual-row count is the primary BOM-match decision: if the harness sheet calls for an 18-circuit Micro-Fit 3.0 header, this is the part. The 9.91 mm insulation height and 3.18 mm post length are the board-level stack dimensions that govern hole size and keep-out on the PCB layout.
Typical applications and environments
Listed applications span automotive, industrial, medical, and telecommunications — environments that require elevated temperature survivability, vibration resistance, and UL94 V-0 flammability rating. The -40 to 105 °C operating range covers both cold automotive and warm industrial enclosures. No IP rating is listed — fit is inside-the-enclosure or under-hood with a sealing gasket on the mating face only.
Sourcing and lifecycle
The 430451812 carries an Active lifecycle status and ROHS3 Compliant designation. It is quoted to order against the BOM quantity via RFQ. No official successor order code is listed on record for this part.