The 1N3645 from Semtech is a Space Qualified 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 2000 V, Repetitive Peak Reverse Voltage 2000 V. Tags: Through Hole. More details for 1N3645 can be seen below.