I am looking for max junction temp and theta_jc for MSP430FR50431IPM
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Please see section 5.12 of the datasheet for the thermal characteristics.
The junction rating is equal to the ambient rating on this device. Due to the low power nature of these parts, there is not any significant thermal rise relative to ambient which is why only one temperature is specified. From a design point of view the Tj spec is 85C.
Here is another e2e post discussing this as well.