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Original question:

MC33078: datacode

MC33078: Failure of components, recognizable by strong heating

Thorsten Schneider
Prodigy 10 points
Part Number: MC33078

Tool/software:

Similar to the task e2e.ti.com/.../mc33078-datacode, we also have problems with the MC33078 in an application that has been in production for several years. The error is manifested by the defective components heating up considerably, along with increased current consumption.

Initial investigations have shown that the manufacturing week December 2022 is affected. However, it cannot be ruled out at the moment that other slots are also affected.

Is there any information yet as to what the cause of these errors could be?

  • 0
    TI__Guru 55491 points

    Hi Thorsten,

    I read the thread below - There was no change in production flow or manufacturing site.  The product is supported by HVA team now. 

    https://e2e.ti.com/support/audio-group/audio/f/audio-forum/1391612/mc33078-datacode

    Thorsten Schneider said:
    Is there any information yet as to what the cause of these errors could be?

    The picture looks like a thermal image and the part is heating up. Do you have temperature bar information about the hot spot. And I need to have the schematic to understand what may be the root cause. 

    This is dual package and short circuit current is shown below. 

    I need to know the following information etc. 

    1. op amp supply rail voltage level. 

    2. Output voltage swing, load and load type.

    3. Input signal type, amplitude and frequency and gains

    4. Tamb operating temperature. 

    5. The part is heating up due to sourcing, sinking in current or both. 

    Best,

    Raymond