The STS321050U852AH from Eaton is a Power Diode with Reverse Current 1.0 µA, Reverse Voltage 5 V, Temperature operating range -55 to 150 Degree C, Reverse Breakdown Voltage 6 to 8 V, Total Capacitance 850 to 1050 pF. Tags: Surface Mount. More details for STS321050U852AH can be seen below.