The 1N3646 from Semtech is a Power Diode with Forward Current 0.6 to 0.26 A, Forward Voltage 5.00 V, Reverse Current 1.00 to 20.0 uA, Reverse Voltage 2500 V, Repetitive Peak Reverse Voltage 2500 V. Tags: Through Hole. More details for 1N3646 can be seen below.