What this header is and where it sits in the series
The Molex 367590063 is the 4-circuit member of the MLX 43255 family — a single-row board-to-cable header with a 0.250-inch (6.35 mm) pitch and through-hole solder termination. The housing is black PA66 nylon, the contacts are phosphor bronze with 137.8 µin (3.50 µm) tin plating on both the mating side and the solder-tail post, and the body carries a UL94 V-2 flammability rating. The locking ramp on the header body secures the mating half, and the board guide feature aids alignment during assembly. All four positions are fully loaded at the factory.
Mating half and what to know before you commit
This is a board-to-cable header — the mating half is a matching receptacle or plug housing that accepts wire-ended contacts. Confirm the wire gauge and termination style (crimp or solder) of the mating half before specifying, since the locking ramp on the header expects the plug to be drawn fully home. The board guide feature reduces lateral shift during mating, which matters in multi-position assemblies where outer-pin alignment drives the inner pins home. If your board stack is at the limit of the 13.97 mm (0.550-inch) insulation height, check that the mated pair clears any tall adjacent components on the PCB.
Sourcing posture — active, quoted to order
The 367590063 carries an Active product status — no LTB, EOL, or NRND notice on record for this series member. Sourced against BOM quantity by RFQ. Confirm circuit count and pitch match the board layout before committing; the 4-position count is the only size in this specific series listing, so there is no position-count delta to exploit within the MLX 43255 family.