The HR1N6642 from Micross is a Space Qualified Diode with Dynamic Resistance 150 Degree C/W (Thermal), Forward Current 0.3 A, Forward Voltage 0.8 to 1.2 V, Reverse Current 0.025 to 100 uA, Reverse Voltage 75 V. Tags: Axial-Lead. More details for HR1N6642 can be seen below.