The HR1N5551US from Micross is a Space Qualified Diode with Forward Current 3 to 5 A, Forward Voltage 1 V, Reverse Current 1 to 60 uA, Reverse Voltage 400 V, Non-Repetitive Peak Forward Current 100 to 150 A (surge). Tags: Surface Mount. More details for HR1N5551US can be seen below.