The STPS4045C-Y from STMicroelectronics is a Power Diode with Forward Current 20 to 40 A, Forward Voltage 0.56 to 0.94 V, Reverse Current 200 uA, Repetitive Peak Reverse Voltage 45 V, Non-Repetitive Peak Forward Current 220 A. Tags: Through Hole. More details for STPS4045C-Y can be seen below.