• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 31 subscribers
  • Views 135 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM75A: Absolute rating of Tj max

Lilian Chang
Intellectual 1555 points
Part Number: LM75A
Other Parts Discussed in Thread: TMP117, TMP116

Hi Team,

There is a question of LM75A. In the datasheet, recommended operating conditions of TJ temp range is -55C~125C.

What's the absolute maximum ratings of Tj Max?  Can we support Tj max up to 150C?  

Thank you.   

  • 0
    TI__Mastermind 34275 points

    Hi Lilian,

    No variant of 75 can report a temperature above 127C. The way the data is encoded in 8 bits won't allow it. 

    Further, I can't make any promises beyond the datasheet specifications.

    Here's a list of I2C temperature sensors with 150C operating range. The TMP116 also supports 150C operation, but accuracy is not guaranteed above 125C. TMP116 is a lower cost version of our flagship sensor TMP117.

    https://www.ti.com/sensors/temperature-sensors/digital/products.html#p1192=0;150

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    TI__Intellectual 1555 points

    Hi Ren,

    Thanks for your reply, I understand that LM75 can't work at temp over 127.  But my customer's question is if the LM75 Tj junction temp can accept 125~150C but device will not be damaged?  they don't need LM75 working at 125~150.  

    In the datasheet, our recommended operation rating of Ta range is -55~125. For my understanding, when the Ta=125C, Tj will be 150C around?  right?   

    Thank you.

  • 0 in reply to Lilian Chang
    TI__Mastermind 34275 points

    Hi Lilian,

    For temperature sensor, we expect Ta=Tj. The sensor does not consume significant power to raise it's internal temperature. If it did, it would not be a very good sensor.

    thanks,

    ren