The BAT54-Y from STMicroelectronics is a Power Diode with Forward Current 0.3 A, Forward Voltage 0.32 to 0.90 V, Reverse Current 1 to 100 uA, Repetitive Peak Reverse Voltage 40 V, Non-Repetitive Peak Forward Current 1 A. Tags: Through Hole. More details for BAT54-Y can be seen below.