The STS321240B301AH from Eaton is a Power Diode with Reverse Current 1.0 µA, Reverse Voltage 24 V, Temperature operating range -55 to 150 Degree C, Reverse Breakdown Voltage 26.7 V, Total Capacitance 30 to 35 pF. Tags: Surface Mount. More details for STS321240B301AH can be seen below.