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The 1N5819 is a Schottky barrier diode, a type built on a metal-to-silicon junction rather than the silicon-to-silicon junction of a standard diode, which gives it a notably lower forward voltage drop. That lower voltage drop means less power is wasted as heat when current flows through it, which matters directly in switching power supplies, DC-DC converters and reverse battery protection circuits, where efficiency losses add up across many switching cycles per second.
It is rated for a peak repetitive reverse voltage of 40V and an average rectified output current of 1A, figures that place it firmly in the small-signal and low-power switching category rather than anything handling mains-level voltages or high current.
Because Schottky diodes rely on majority carrier conduction rather than the minority carrier recombination that slows down standard diodes, the 1N5819 has low stored charge and can switch on and off quickly, which is exactly what a high-frequency switching supply needs to operate efficiently. A guard ring structure adds ruggedness against reverse voltage spikes, and the part carries lead-free plating for modern environmental compliance.
Operating junction temperature is rated from -65C to 125C, with storage temperature extending to 150C, and it tolerates a non-repetitive peak forward surge current of 25A, giving it some margin against brief current spikes. It comes in a molded epoxy case and weighs about 0.4 grams, with a maximum lead soldering temperature of 260C for up to 10 seconds.
Anyone designing or repairing a small switching power supply, adding reverse-battery protection to a battery-powered project, or building a DC-DC converter where every bit of efficiency matters will find the 1N5819 a standard, well-proven part for the job.
A Schottky barrier diode.
40V peak repetitive reverse voltage.
1A average rectified output current, with a 25A non-repetitive surge rating.
It has a much lower forward voltage drop, which wastes less power as heat and improves efficiency.
-65C to 125C junction temperature.
| Brand | Generic |
|---|---|
| Selling unit | PCS |
