The D4201N22T from Infineon Technologies is a Power Diode with Forward Current 4240 A, Reverse Current 200 mA, Repetitive Peak Reverse Voltage 1600 to 2200 V, Non-Repetitive Peak Forward Current 88000 A, Temperature operating range -40 to +160 Degree C. Tags: Ceramic. More details for D4201N22T can be seen below.