The Molex 0919990499 is a 2-position header from the Appli-Mate 91999 series, carrying male blade contacts on a single row at 0.197" (5.00 mm) pitch. It is a through-hole solder part in a natural polyamide housing, designed as the board-mounted half of a wire-to-board power interconnect. The pair of silver-plated brass blades are rated 16 A per circuit at 250 V, which puts this squarely in the low-to-moderate power distribution class — think appliance control boards, HVAC fan modules, or small power supply outputs where a compact two-wire connection is needed.
The Silver Plating Tells the Story
Silver gives lower contact resistance than tin and handles higher operating temperatures without oxidation creep, but it tarnishes in sulphurous atmospheres. The practical takeaway: this header is specced for applications where the mated pair will stay connected for long periods at elevated temperature (the housing is rated -20°C to 120°C), not for frequent unmating cycles where gold would be preferred. The latch lock fastening keeps the blade pair engaged under vibration once mated.
The 5.00 mm pitch gives generous creepage for the 250 V rating — the board footprint is straightforward, with two solder tails on 5.00 mm centres.
No obsolescence notice, no last-time-buy clock. There is no documented direct cross-reference from Molex; if a form-fit-function alternative is needed, it would have to match the 5.00 mm pitch, 2 positions, through-hole mounting, and the 16 A silver-plated contact set.