What it is
The Molex 430451216 is the 12-circuit member of the Micro-Fit 3.0 43045 dual-row header family. Board-to-cable orientation, surface-mount termination, male pin contact type with square pin shape. The four-wall shroud and locking ramp lock the header into its matching receptacle housing before the board-level strain hits the solder joints.
Key ratings and what they mean
12 positions across 2 rows at 0.118 in (3.00 mm) pitch — the standard Micro-Fit 3.0 footprint shared across the full 43045 series, so the board hole pattern and routing pitch are fixed by the series, not this variant. Confirm your circuit count is exactly 12; a larger or smaller position count in the same series will not share the same board footprint. 8 A per circuit at the mating interface. The gold finish on the mating side (15.0 µin / 0.38 µm) supports repeated mate/de-mate cycles without the tin fretting risk that accrues on gold-free contacts at high cycle counts. The tin-plated solder tails (100.0 µin / 2.54 µm) give a robust solder joint — that tin thickness is at the heavy end for SMT, which matters if the board goes through multiple reflow profiles. 600 V rating covers industrial mains-adjacent bus and power-distribution positions without derating. The -40°C to 105°C operating window handles most factory-floor and under-hood environments; the LCP housing is glass-filled and rated UL94 V-0. The board-lock feature is what keeps this SMT header coplanar during reflow and under vibration in service — non-locking SMT headers can lift at the heel of the solder joint under cable pull, and the locking ramp on the mating face compounds that risk if there is no board-lock to counter it. With the lock, the header takes more of the cable-side pull before the joint sees it.
Where this class is used
Board-to-cable power and signal distribution in harness assemblies — automotive ECU and module interconnects, industrial automation control nodes, medical device power rails, and telecom infrastructure power bussing. The dual-row layout and 600 V rating put it in mid-current power duty rather than pure signal use.