1N5819W

1N5819W is a Schottky diode from JSMSEMI in SOD-123, verified against the maker’s own datasheet, which prints the bare code and package marking S4. Verified figures: repetitive peak reverse voltage of 40 V, forward voltage of 0.37 V at 20 mA and 0.60 V at 200 mA, average forward current of 350 mA, power dissipation of 400 mW and a reverse recovery time of 10 ns. One figure is deliberately absent: the surge-current line is not legible in the captured maker document, so no surge value is claimed here rather than borrowed from another maker’s 1N5819W sheet. Selection advice: keep this code separate from the 1N5819WS in SOD-323 — a different package and a different device row — and from other makers’ 1N5819W offerings, whose figures differ; the JSMSEMI numbers above are the ones an offer should be checked against. Parameters verified against the JSMSEMI 1N5819W datasheet.