The Molex 430452421 is the 24-circuit member of the Micro-Fit 3.0 43045 series — a dual-row, right-angle header designed for board-to-cable power distribution in automotive, industrial, medical, and telecom applications. The header mates with the matching Micro-Fit 3.0 receptacle housings (female), and the locking ramp on the housing side holds the connection under vibration without a separate fastener. Contacts are tin-plated at 60.0 µin (1.52 µm) on the mating face — suited for power delivery rather than high-cycle signal mate/unmate cycles.
Key ratings and what they mean
Pitch is 0.118" (3.00 mm), matching the standard Micro-Fit 3.0 receptacle footprint. The 24 positions in a dual-row layout (0.118" row spacing) give a harness designer the density needed for multi-circuit power distribution while retaining a manageable board footprint. Current rating is 8 A per circuit at up to 105 °C operating temperature. Voltage rating is 600 V, well above typical automotive and industrial bus levels, so voltage is not the limiting factor on this header. Tin plating at 60.0 µin (1.52 µm) on both the mating face and the solder post gives good solderability and decent wear resistance for a limited number of mate cycles. If the application requires hundreds of reconnections, a gold-plated Micro-Fit 3.0 variant would be the better choice — the tin grade in this part is optimised for fixed harness-to-board power links, not field-service cycling. The 4-wall shroud fully encloses the contact array on all four sides, providing polarisation keying against mismating and protecting the contacts from side-entry debris in harness routing. The board-lock feature anchors the header to the PCB during wave or hand soldering, reducing the risk of the unit lifting at the solder joint. Operating temperature range is -40 to 105 °C with an UL94 V-0 rated LCP housing — this combination covers sealed automotive engine-bay harness zones and industrial equipment enclosures without a separate flame-retardant boot or shroud cover.