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DS90CF384A package thermal resistance

NAOKI AOYAMA
Guru 11215 points
Other Parts Discussed in Thread: DS90CF384A

Hello,

My customer uses the DS90CF384AMTD/NOPB.

He wants to know Package Thermal Resistance value.

Please tell me the Value.

Package: DGG-56(TSSOP)

Regards,

Naoki Aoyama

 

  • 0
    TI__Mastermind 29655 points

    Hi Naoki-san,

    The thermal resistance is given in the form of "package derate", which is the inverse of thermal resistance (degrees C/W). Please refer to the abx max table below:

    Thanks,

    Michael

  • 0 in reply to Michael Lu (Santa Clara)
    Guru 11215 points

    Hi Michael,

    Thank you for your fast reply.

    How about a junction-to-case thermal resistance?

    My customer check a temperature of top of case.

    So he wants to know a junction-to-case thermal resistance.

    Regards

    Naoki

  • 0 in reply to NAOKI AOYAMA
    TI__Mastermind 29655 points

    Hi Naoki-san,

    Unfortunately, the datasheet does not have this information, and I have found only limited resources about what the exact junction-to-case thermal resistance (Theta-JC) of the CF384A could possibly be.

    As mentioned before, the Theta-JA can be calculated by taking the inverse of the derate, so 1/(0.0124) = 80.64 (C/W). I have found that for a similar 56-pin TSSOP package on an NSC legacy DS90CR581/DS90CR582, the junction-to-case thermal resistance is around 24-26.2. I cannot guarantee that the DS90CF384A will match within this range, but the figure should be a reasonable starting point.

    Thanks,

    Michael

  • 0 in reply to Michael Lu (Santa Clara)
    Guru 11215 points

    Hi Michael,

    Thank you for your fast reply.

    I will feedback to my customer your informations.

    Because he can only check the package temperature, he wants to know Theta-JC.

    I hope  that parameter will be mentioned on the datasheet someday.

    Thanks

    Naoki Aoyama