The JAN1N3647 from Micross is a Space Qualified Diode with Dynamic Resistance 18 to 90 Degree C/W (Thermal), Forward Current 0.26 to 0.6 A, Forward Voltage 5 V, Reverse Current 1 to 20 uA, Reverse Voltage 3000 V. Tags: Axial-Lead. More details for JAN1N3647 can be seen below.