The STS321150U751AH from Eaton is a Power Diode with Reverse Current 0.1 to 0.2 µA, Reverse Voltage 15 V, Temperature operating range -55 to 150 Degree C, Reverse Breakdown Voltage 16 to 19 V, Total Capacitance 75 to 90 pF. Tags: Surface Mount. More details for STS321150U751AH can be seen below.