The HRF20 from Micross is a Space Qualified Diode with Forward Current 0.16 to 0.35 A, Forward Voltage 5 V, Reverse Current 0.25 to 10 uA, Reverse Voltage 2000 V, Repetitive Peak Reverse Voltage 2000 V. Tags: Axial-Lead. More details for HRF20 can be seen below.