The STS321050B100AH 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 6.0 V, Total Capacitance 1.0 to 1.5 pF. Tags: Surface Mount. More details for STS321050B100AH can be seen below.