The STS321120U372AH from Eaton is a Power Diode with Reverse Current 1.0 µA, Reverse Voltage 12 V, Temperature operating range -55 to 150 Degree C, Reverse Breakdown Voltage 13 to 17 V, Total Capacitance 370 to 450 pF. Tags: Surface Mount. More details for STS321120U372AH can be seen below.