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The actual characteristics of the surge voltage, the left figure shows the surge voltage characteristics of the U series IGBT 6MBI450U-120 when it is turned off. In general, the more collector current, the greater the surge voltage at turn-off.
The figure below shows the surge voltage during reverse recovery of the FWD of the U series IGBT 6MBI450U-120. Generally, the collector current is in a low current range of a fraction to a tens of a fraction of the rated current, and the surge voltage at the time of reverse recovery becomes large. Please confirm that all operating conditions are within RBSOA or within VCES. 
December 27, 2022