The JAN1N5811 from Micross is a Space Qualified Diode with Dynamic Resistance 22 to 90 Degree C/W (Thermal), Forward Current 1.7 to 6 A, Forward Voltage 0.875 V, Reverse Current 5 to 150 uA, Reverse Voltage 150 V. Tags: Axial-Lead. More details for JAN1N5811 can be seen below.