The JAN1N5621 from Micross is a Space Qualified Diode with Forward Current 2 A, Forward Voltage 1.2 to 1.6 V, Reverse Current 0.5 to 55 uA (Leakage), Reverse Voltage 800 V, Repetitive Peak Reverse Voltage 800 V. Tags: Axial-Lead. More details for JAN1N5621 can be seen below.