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SN65LVDS93A-Q1: temperature issue

Xiaoxiang Liu
Expert 4085 points
Part Number: SN65LVDS93A-Q1

Hi Team,

Our actual air temperature is below 80°C, and the temperature of the board is 96°C,

but the junction temperature of the chip is calculated to be less than 100°C. Can the chip work in this way?

Thanks

Xiaoxiang

  • 0
    TI__Guru** 100995 points

    Xiaoxiang,

    Our operating temp specs are always in terms of ambient temp. So as long as the ambient temp around the IC is < 85C, then it is supported.

    Best Regards,

    Casey 

  • 0 in reply to Casey McCrea
    TI__Expert 4085 points

    Hi Casey,

    I have a question, the ambient temperature of the chip is less than 85°C, but the chip is attached to the board, the temperature of the board is 96°C, and the internal junction temperature is only 97°C by calculation, is there a problem in this situation?

    Thanks

    Xiaoxiang

  • 0 in reply to Xiaoxiang Liu
    TI__Guru* 87750 points

    Hello Xiaoxiang,

    how did you come up with only increase of 1°C between board and Junction? What is your PCLK frequency?

  • 0
    Prodigy 10 points

    Dear all，

    I ‘m the electronic engineer of this project. Let me introduce the situation.

    In our case, the work frequency of the chip is only 39MHz, the power supply is about 36mA .

    According to the datasheet, the ψJT is 0.4°C/W. In our calculation, the worst-case power is about 0.33W. The temperature rise is less than 0.2℃ .

    We have check with TI before , the temperature between ambient and junction is very, very closed.

    Therefore, the junction temperature of the chip will so close to 96°C. Much less than 105 ° C.

     I do need your advice about this working state. I hope you can reply as soon as possible.

    Thank you very much.

  • 0 in reply to Huatao Zhang
    TI__Expert 4085 points

    Hi Hamzeh,

    Huatao helped explain the whole usage scenario.

    So we want to know if the ambient air temperature of the chip is lower than 85°C, the temperature of the chip surface and the board is higher than 85°C, but the junction temperature is lower than 105°C, is this feasible?

    Thanks

    Xiaoxiang

  • 0 in reply to Xiaoxiang Liu
    TI__Guru* 87750 points

    Hello Huatao,

    As Casey said above, as long as your ambient temperature is below 85C you should be in the safe side. Also, based in your calculations, your Junction Temperature is below the max supported, 105C, which is also fine.