The 1N5819U from STMicroelectronics is a Power Diode with Forward Current 1 A, Forward Voltage 0.35 to 0.8 V, Reverse Current 10 to 20 uA, Repetitive Peak Reverse Voltage 45 V, Non-Repetitive Peak Forward Current 25 A. Tags: Surface Mount. More details for 1N5819U can be seen below.