Schotttky diode rectifiers axial taiwan semiconductor 1n5819 the 1a schottky diode rectifier 1n5819 1a 20v is a diode device that is of an epitaxial construction and has a guard ring for transient protection ideal for use in low voltage high frequency equipment and for free wheeling and polarity protection applications taiwan semiconductor 1n5819 schottky diode 1a 40v do 41