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What does derating of Safe Operating Area (SOA) mean?

Derating of SOA is to calculate the SOA based on the ambient temperature (or case temperature) of semiconductor device in operation.
The SOA in the datasheet is specified at 25 [deg.C] (ambient temperature or case temperature).
When the ambient temperature (or case temperature) is higher than 25 [deg.C], the SOA becomes narrow.
SOA should be limited by allowable power dissipation (within the junction temperature at the absolute maximum rating) based on ambient temperature.

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