atdavid516 posts11-25-2019 11:00amNote that MOSFETs don't have secondary break-down effects, hence EPDR is not nearly as critical for FET output stages. They don't mind high instantaneous power.
When did you last look at a MOSFET SoA plot? Its true that going back 30 years or more they generally didn't have secondary breakdown issues but these days its rare to find an SoA plot which is purely thermally limited.