thermal impedeance junctoin to case

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Zak28

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This transistor does not have max junction temperature listed but has derate value 267mW/C and power dissipation 20W. Is there any way to obtain its thermal resistance junction from case from listed parameters?

 

Yes, the derating number is equal to thermal impedance. It's by the way referring to Tj,max of 100°C.
 
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FvM said:
Yes, the derating number is equal to thermal impedance. It's by the way referring to Tj,max of 100°C.
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Thereby 20watts / 0.267derate = 74.906367 this is over 25c ambient which makes permissible junction temperature at 99.906367C. This is what you were referring to as 100c max?
 

This particular part doesn't appear to be computable as no derate or junction temperatures are listed however its quite a large transit frequency for such a part, these are typically slow. Can max junction temperature be obtained from only listed parameters?

 

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