Who this Micro-Fit 3.0 header is for
The Molex 430450419 is the 4-circuit, dual-row SMD header in the Micro-Fit 3.0 43045 series. It connects a board to discrete wires via a mating receptacle housing — the locking ramp keeps the pair together in environments where vibration or cable yank would pop an unlatched connector. The gold-over-nickel mating surface (15.0 µin) is specced for repeated mating cycles; the tin-plated solder tails handle reflow without issue.
What the 8 A rating means in practice
8 A per circuit is not a derated signal current — it's a power-level rating for a 3.00 mm pitch header. Derate above 105 °C per the manufacturer's curve; within the rated range, the contact temperature rise stays under the LCP housing's limit.
Board-fit and mounting details
Shrouded on all four walls, so the mating receptacle aligns without stubbing pins. The 0.118 in (3.00 mm) row-to-row spacing matches the pitch, giving a symmetrical footprint for the dual-row layout. Insulation height is 0.390 in (9.91 mm) above the board, which clears most low-profile enclosures.