The HRS20F from Micross is a Space Qualified Diode with Dynamic Resistance 18 to 90 Degree C/W (Thermal), Forward Current 0.23 to 0.5 A, Forward Voltage 5 V, Reverse Current 1 to 25 uA, Reverse Voltage 2000 V. Tags: Axial-Lead. More details for HRS20F can be seen below.