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Theta JC of LTC4313IDD2#PBF

Thread Summary

The user inquired about the thermal resistance (theta-JC) for the LTC4313IDD2#PBF. The support engineer explained that due to the low power dissipation, the junction temperature is nearly equal to the ambient temperature, making the distinction between theta-JA and theta-JC negligible. For reference, the generic DD package has a theta-JA of 43 deg C/W and a theta-JC of 5.5 deg C/W.
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Category: Datasheet/Specs
Product Number: LTC4313IDD-2#PBF, LTC4313

I would like to know LTC4313IDD2#PBF's thermal resistance between junction and case, that is theta-JC.

Theta-JA is on the pin configuration section in the datasheet but theta-JC is not.

Please advise.

  • Hello Satoru,

       Because this part doesn't include any large FETs or other devices which will be dissipating meaningful amounts of power there will be effectively no self-heating and the junction temperature will be pretty much equal to the ambient temperature independent of using Theta-JA or Theta-JC. 

       That being said, for a generic DD package, Theta-JA = 43 deg C/W and Theta-JC = 5.5 deg C/W.  Note that the generic package Theta-JA is slightly different from the value in the datasheet.  I've shared it for reference since it was calculated for the same generic package model used for the Theta-JC.

    Eric

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