I don't understand the terms of the datasheet, to compare in depth. But what I read in the datasheet the original has Icm and Ifm of 220A and the replacement has this value in 90A. I'm not sure what this parameter is and if it's causing these burns
The Original IGBT also has anti-parallel diode.First comment, both devices are different in so far that IKW30N60 has an anti-parallel diode and the obsolete device has not. Depending on the application circuit, the difference may matter.
For a circuit that withstands load shorts by chance rather than by design, finding a replacement type involves some engineering effort. Ultimately, the circuit would be supplement by an overcurrent detection or load short shut down feature. Using a "stronger" IGBT might work, but not necessarily.
According to datasheet it has not, see reverse breakdown voltage specification. There may be an external diode in the circuit.The Original IGBT also has anti-parallel diode.
A friend told me that it might be necessary for IGBT to have SOA (short circuit safe operating area)
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