The JAN1N5809 from Micross is a Space Qualified Diode with Forward Current 1.7 to 6 A, Forward Voltage 0.875 V, Reverse Current 5 to 150 uA, Reverse Voltage 100 V, Repetitive Peak Reverse Voltage 100 V. Tags: Axial-Lead. More details for JAN1N5809 can be seen below.