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MSP430F5510: Shelf Life of ICs

Part Number: MSP430F5510

Hi,

As per second paragraph of Andre Frantzke's reply dated Sep 14, 2018 8:16 AM; we had to check current consumption on VUSB pin. To perform the same, we cut some tracks and tried to measure current but instead we found something else which was matching with second paragraph of Dietmar Walther's response dated Sep 14, 2018 10:57 AM.

 

In addition, we can also mention in response that we have also tried to decrease capacitance on DVCC pin as per their suggestion, but the result was same. This again makes us to believe that the issue is only because of humidity.

 

Request you to please do the needful

  • Atul,

    sorry I'm a bit confused to what paragraph you refer from my post:

    1. Is it about the faster power cylcing by removing capacitors?
    The question is how much capacitance you have on the supply? If it is too much it can fail.


    2. Or do you refer on the humidty topic?
    I mean if you solder parts which not handled accordingly means you soldered parts with a red humidty lable you might run into delamination
    issues. But this is only an assumption and answer to your questions.

    Please help to clarify you comment above.
  • Hi Atul,

    can you please comments on the last questions or is the problem already resolved. This thread is inactive for some time and we plan to close it. So please let us know if you need anything else.
  • Hi,
    I am referring to the point on Humidity. Request you to go thro the entire e2e link on this subject. A part of it is given below :-
    This points us to believe that the exposure of chips to humidity has permanently damaged them because of higher soldering temperature. However, to confirm the same, we will have to bake remaining ICs and then check if all of them are working as desired.

    Will baking the ICs resolve this issue ?
    Regards
    Atul Bhakay
  • Atul,

    got it. Yes a bake will help. I checked our spec and can tell you that our dry bake happens at 125 degC (+/- 5degC min/max) for 8 hours.
    Afterwards delamation shoudl not be a problem anymore if you do not store them again for longer time frame.

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