The STS321240U401AH from Eaton is a Power Diode with Reverse Current 0.1 µA, Reverse Voltage 24 V, Temperature operating range -55 to 150 Degree C, Reverse Breakdown Voltage 26.4 to 32.0 V, Total Capacitance 40 to 70 pF. Tags: Surface Mount. More details for STS321240U401AH can be seen below.