The 1N5819 is a Schottky diode that is widely used in a variety of electronic circuits. It is a type of rectifier diode that is designed to rectify alternating current (AC) into direct current (DC). The 1N5819 has a forward voltage drop of approximately 0.45V and is able to handle a maximum current of 1A. It is also rated for a maximum reverse voltage of 40V.

Schottky diodes are known for their fast switching speed and low forward voltage drop, which make them suitable for use in high-frequency circuits and in applications where power efficiency is important. They are also used to prevent voltage spikes, eliminate noise, and protect circuits from damage.

The 1N58xx is a series of medium power, fast, low voltage Schottky diodes, which consists of part number numbers 1N5817 through 1N5825

The 1N581x are typically packaged in the DO-41 axial through-hole case, and in many cases are interchangeable with the 1N4001 series. The 1N582x are typically packaged in the DO-201AD through-hole case, and in many cases are interchangeable with the 1N54xx series.

Being Schottky diodes, the 1N58xx parts have roughly half the forward voltage drop of the 1N400x/1N540x series diodes, which improves efficiency in applications where they are usually forward-biased, such as power converters. The cost is a lower voltage rating and higher reverse leakage (approximately 1 mA at room temperature and increasing with temperature).