The STS521050U751AH from Eaton is a Power Diode with Forward Voltage 0.8 to 1.1 V, Reverse Current 0.01 to 0.1 µA, Reverse Voltage 5 V, Temperature operating range -55 to 150 Degree C, Reverse Breakdown Voltage 6 to 8 V. Tags: Surface Mount. More details for STS521050U751AH can be seen below.