The JAN1N5554US from Micross is a Space Qualified Diode with Dynamic Resistance 6.5 Degree C/W (Thermal), Forward Current 3 to 5 A, Forward Voltage 1 V, Reverse Current 1 to 60 uA, Reverse Voltage 1000 V. Tags: Surface Mount. More details for JAN1N5554US can be seen below.