The IDK20G120C5 from Infineon Technologies is a Power Diode with Forward Current 20 A, Forward Voltage 1.5 V, Reverse Current 0.0085 to 0.123 mA, Repetitive Peak Reverse Voltage 1200 V, Non-Repetitive Peak Forward Current 198 A. Tags: Surface Mount. More details for IDK20G120C5 can be seen below.