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CD54HC138: CD54HC138F3A thermal resistance

Aaron Spaete
Expert 4452 points
Part Number: CD54HC138

Team,

My customer has the following question:

I have a couple of questions regarding some Texas Instruments part numbers CD54HC138F3A, CD54AC273F3A and CD54HC273F3A.

 

The datasheet or the website do not include information regarding the power dissipation of the parts mentioned above or the thermal resistance (JθC). Can you please help me finding this information for each of the three parts?

Regards,

Aaron

  • 0
    TI__Guru 62930 points
    Aaron,
    The devices should have a Cpd parameter listed (I checked the HC138). This parameter can be used to determine the dynamic power dissipation. In the HC138, it is listed with 2 notes that describe the equation for Pd.

    With respect to the theta Jc. I will have to request these be modeled. This process takes about 2 weeks to complete. I will work on getting them submitted today.

    Regards,
    Wade
  • 0 in reply to Wade Vonbergen
    TI__Guru 62930 points
    Aaron,
    The modelling completed.
    Here are results:
    CD54HC138F3A
    Theta JA-High K 71.0
    Theta JC, top 41.4
    Theta JB 57.6
    Psi JT 31.9
    Psi JB 55.1
    Theta JC, bottom 16.8

    CD54AC273F3A
    Theta JA-High K 65.2
    Theta JC, top 35.6
    Theta JB 51.7
    Psi JT 26.2
    Psi JB 49.3
    Theta JC, bottom 11.6

    CD54HC273F3A
    Theta JA-High K 68.2
    Theta JC, top 38.5
    Theta JB 54.7
    Psi JT 29.1
    Psi JB 52.3
    Theta JC, bottom 14.1

    If this answers your question, please click "Verify it as the answer"
    Regards,
    Wade