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