The C4D40120D from Wolfspeed is a Power Diode with Forward Current 54 A, Forward Voltage 1.5 to 3 V, Reverse Current 400 uA, Repetitive Peak Reverse Voltage 1200 V, Non-Repetitive Peak Forward Current 110 to 1150 A. Tags: Through Hole. More details for C4D40120D can be seen below.