What this header is
The Molex 430451228 is the 12-position member of the Micro-Fit 3.0 43045 series — a dual-row male header rated 8 A per circuit at 600 V. The pitch is 3.00 mm (0.118"), row spacing is 0.118", and all 12 positions are loaded. Mating contact finish is gold at 15.0 µin (0.38 µm); the solder tail finish is tin at 100.0 µin (2.54 µm). The split plating grade reflects the different environments — the gold side handles repeated mating cycles, the thick tin tail handles solder thermal exposure and board stress. The housing is glass-filled liquid crystal polymer in black, rated UL94 V-0, with an insulation height of 0.390" (9.91 mm). Four-wall shrouding and the locking ramp on the header body provide mis-mate prevention and retention in high-vibration environments. Operating temperature runs from -40°C to 105°C. Contact material is brass; the termination style is through-hole solder with a post length of 0.125" (3.18 mm).
How it fits into the series
The pitch, row spacing, and shroud geometry are consistent across the 43045 series, so any compatible receptacle housing with the same circuit count is a direct mating candidate.
Sourcing posture
Quoted to order against the BOM quantity via RFQ — confirm the circuit count matches your BOM line and that your receptacle housing carries the same 12-position dual-row specification before committing.
What this connector class is used for
Micro-Fit 3.0 headers are a standard board-to-cable interconnect in harness assemblies across industrial automation, telecommunications, medical equipment, and automotive systems. The locking ramp and shroud make them suited for applications where vibration or cable pull forces are present — the retention features keep the mated pair seated without a secondary clip.