The STPS3L40-Y from STMicroelectronics is a Power Diode with Forward Current 3 A, Forward Voltage 0.40 to 0.62 V, Reverse Current 100 uA, Repetitive Peak Reverse Voltage 40 V, Non-Repetitive Peak Forward Current 75 A. Tags: Surface Mount. More details for STPS3L40-Y can be seen below.