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Which is the maximum operating temperature of the integrated shunt resistor?

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Part Number: INA260

Hi TI team,

I designed a PCB where I use 2 INA260 in parallel to measure current up to 30A continuous and up to 40A with 60s current pulse. I'm using a thermal imaging camera to check the chip temperature at high current rate.

I see the shunt temperature to rise up to 125°C at 30A continuous and around 150°C at 40A after few seconds. The ADC part of the chip seems to remain in the operating range temperature.

I'm not sure if it is safe to use or if I have to change the PCB layout. In the datasheet is stated that the maximum junction temperature is 150°C.  Does it refer to the shunt part of the chip or it can reach higher temperature? 

  • Hi Ian,

    For over current conditions, please refer to datasheet section 8.3, specifically this figure:

    The max junction temperature refers to both the shunt and the chip, whichever is higher. At specified 15A, the shunt temperature is approximately 150°C. Your continuous condition test result is consistent with this specification (case temp 125°C).

    Regards, Guang

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