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DS25BR204: Thermal Resistances

Ron Harms
Prodigy 10 points
Part Number: DS25BR204

In the data sheet for thermal resistance, there is a Theta JC & Theta JA defined.  How is Theta JC defined? As the resistance between the junction temp and the top of the case? Or the resistance between the junction and the thermal pad?  Pending on how Theta JC is defined, is it also possible to get a Theta JB?

  • 0
    TI__Guru* 93670 points
    Hi Ron,
    Theta JC is the resistance between the junction temperature and top of the case where heat sink could be applied.
    Theta JB highly depends on the PCB board material/layout. You can back calculate Theta JB as follows:
    TJ = Board temperature + Theta JB X Power
    Regards,,,nasser