The 1N5819 is a 1A 40V Schottky Barrier diode in a DO41 type package.
Number of Rectifiers: Single
Diode / Rectifier Type: Schottky
Forward Continuous Current: 1A
Reverse Voltage: 40V
PLEASE NOTE: Never bend the leads in such a way as to apply any stress to the casing. Always use a heat sink when soldering.