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AMC7834: Critical maximum ambient temperature

Marks Greulich
Intellectual 540 points
Part Number: AMC7834

Hi there,

I know that the AMC7834 is specified up to 125°C (guess solderjoint). 

My Questions are - the internal temperature sensor thinks is not directly the solderjoint so there is some margin between. How I can find out how much?


What happens if we try to use the AMC above that 125° (besides minimizing the Lifetime ofcourse)? Where can we see if it is still working or if it is not? Something hard failing? Soft Fails/drifts but where? 

Thanks & regards,
Markus

  • 0
    TI__Guru 53283 points

    Hi Markus,

    It is impossible to determine the temperature variation on the die itself.  That being said, the gradient should be very slight, under 5°C I estimate.  We specify the performance of the device up to 105°C and operation up to 125°C.  By this, we mean that the device will not fail between 105 and 125°, only that the performance (accuracy) of the device will begin to degrade.

    It is difficult to say exactly how you could expect the device to fail at above 125°C.  Generally, there are key components within the design that leave their linearity operation.  Sometimes this exhibits itself with digital communication failing, as the VIH level continues to increase. 

    My advice would be to implement alarms using the local temperature sensor to start shutting down systems at 125°C.

    Thanks,

    Paul