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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?

 

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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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Zak28

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Yes, the derating number is equal to thermal impedance. It's by the way referring to Tj,max of 100°C.
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?
 

Zak28

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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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