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REF80: Does multiple reflow affect the accuracy?

Kei Kuwahara
Expert 7660 points
Part Number: REF80

Tool/software:

Hello team,

My customer is wondering if they do multiple reflows, does it affect the accuracy or temp coefficient of REF80?

Customer might reflow their boards for replacing some other parts on the board for regular maintainance.

Best Regards,
Kei Kuwahara

  • 0
    TI__Expert 8880 points

    Hello Kuwahara-san,

    The main consideration for soldering has to do with the long-term drift. For best long-term drift performance that minimizes calibration requirements, it is recommended to solder REF80 in the last reflow and leave as much time as possible between soldering and usage of REF80. The long term drift becomes extremely close to flat around 300 hours. This can be seen in Section 8.1 of the REF80 datasheet:

    After excess soldering, the initial settling behavior as seen above could be affected. This is why it is recommended to solder REF80 in the last reflow.

    For temperature drift, soldering is not as high of a concern. Additionally, solder shift that affects accuracy should be minimal, but it is recommended to do REF80 in the last reflow.

    Please let me know if there are any other questions.

    Thanks,

    Jackson

  • 0 in reply to Jackson Wightman
    TI__Expert 7660 points

    Hello Jackson-san,

    My question was not during the initial soldering of the device.

    Customer may have to go through reflow after the device has been soldered.
    This is due to some maintenance purposes. (If customer need to replace some other parts beside REF80, then they should reflow the whole board)

    Best Regards,
    Kei Kuwahara

  • 0 in reply to Kei Kuwahara
    TI__Expert 8880 points

    Hello Kuwahara-san,

    It is recommended that REF80 is soldered on the last reflow. Each time it is soldered, the device must settle, so the long-term drift with time essentially starts over from the beginning.

    Thanks,

    Jackson