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TL974-Q1: Thermal information, Psi-JT and Theta-JC

takishin
Expert 2360 points
Part Number: TL974-Q1
Other Parts Discussed in Thread: TL972-Q1,

Our customer has a question about thermal information.
I'm posting the question for the customer.

TL972-Q1 and TL974-Q1.
In current datasheet, only Theta-JA has been shown for each package.

Could you let me know Psi-JT and Theta-JC both for the following devices?

TL972QDRQ1 (SOIC-8pin)
TL972QPWRQ1 (TSSOP-8pin)

TL974QPWRQ1 (TSSOP-14pin)

Thank you in advance.

Best regards,
Takishin

  • 0
    TI__Expert 6625 points
    Hi Takishin,
    We have processed your thermal request. Please allow us up to 5 business days to get back to you with your thermal data.

    Best Regards,
    Bala Ravi
  • 0 in reply to Bala Ravi
    Expert 2360 points
    Hello Bala,

    Thank you for your prompt reply.

    I look forward to hearing from you.

    Best Regards,
    Takishin
  • 0 in reply to takishin
    TI__Expert 6625 points

    Hi Takishin,

                        Please find below the thermal data that you've requested. If this resolved your question, please click "This Resolved my Issue" button.

    Thermal Metric

    TL972Q

    UNIT

    D(SOIC)

    PW(TSSOP)

    8 PINS

    8 PINS

    RθJA Junction-to-ambient thermal resistance

    134.3

    187.9

    °C/W

    RθJC(top) Junction-to-case(top) thermal resistance

    78

    77.2

    °C/W

    RθJB Junction-to-board thermal resistance

    77.6

    118.9

    °C/W

    ψJT Junction-to-top characterization parameter

    25.9

    12.9

    °C/W

    ψJB Junction-to-board characterization parameter

    76.9

    117.1

    °C/W

    RθJC(bot) Junction-to-case(bottom) thermal resistance

    N/A

    N/A

    °C/W

    Thermal Metric

    TL974QPWRQ1

    UNIT

    PW(TSSOP)

    14 PINS

    RθJA Junction-to-ambient thermal resistance

    121.7

    °C/W

    RθJC(top) Junction-to-case(top) thermal resistance

    50.8

    °C/W

    RθJB Junction-to-board thermal resistance

    64.9

    °C/W

    ψJT Junction-to-top characterization parameter

    6.4

    °C/W

    ψJB Junction-to-board characterization parameter

    64.3

    °C/W

    RθJC(bot) Junction-to-case(bottom) thermal resistance

    N/A

    °C/W

    Best Regards,

    Bala Ravi

  • 0 in reply to Bala Ravi
    Expert 2360 points
    Hello Bara,

    Many thanks for taking the time to address my request.
    I'll report this information to our customer.

    By the way, RθJAs are different from the values in the datasheet.

    I have one question.
    Should I use the above-mentioned parameters, not the datasheet?

    Best regards,
    Takishin
  • 0 in reply to takishin
    TI__Expert 6625 points
    Hello Takishin,
    Use the above mentioned parameters for thermal data.

    Best Regards,
    Bala Ravi
  • 0 in reply to Bala Ravi
    Expert 2360 points
    Hello Bala,

    Thank you for your answer.
    I understand.

    Best regards,
    Takishin