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Thread: difference between RthJC and RthJA

  1. #1
    New Member New Member Gate_charger is on a distinguished road
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    difference between RthJC and RthJA

    What is the difference between RthJC and RthJA? We see the same value of Rthjc for CoolMOS TO247 package, CoolMOS DPAK and CoolMOS IPAK

  2. #2

    Infineon Employee
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    RthJC is the thermal impedance between Junction to Case. This is the same irrespective of the package type, except for Full PAK where the mold compound is different / thicker adding thermal impedance. Hence except Full PAK, the remaining packages have the same Rthjc. SOT223 is also an exception, considering a very small package structure. This does not include the heat sink.

    RthJA is the thermal impedance between Junction to Ambient. This includes the heat sink. Hence based on the standard heat sink assembly used during device characterization, the RthJA of different packages are different.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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