The 1N6640U from STMicroelectronics is a Power Diode with Forward Current 0.3 A, Forward Voltage 0.54 to 1.2 V, Reverse Current 30 to 40 uA, Repetitive Peak Reverse Voltage 75 V, Non-Repetitive Peak Forward Current 2 A. Tags: Surface Mount. More details for 1N6640U can be seen below.