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Syafril's avatar
Syafril
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3 months ago

EP4CGX22CF19C8N Failure Short D8 to C8

We encounter failure for EP4CGX22CF19C8N related to pin D8 to C8. Failure observed during turn on stage on system level. Further verification leading to EP4CGX22CF19C8N shorted related from pin D8 to C8. We conducted ABA swap and the issue resolve. Failure follows the bad part. Table below indicates measurement comparison between good unit and failed unit. Please advise what would be the caused for this issue?

ConditionReading (from U57.D8 to U58.C8)
Good PartOL (Open Loop)
Bad Part2.1 Ohm
quality|reliability

7 Replies

    • Syafril's avatar
      Syafril
      Icon for New Contributor rankNew Contributor
      2 months ago

      Hi Aqid,

      Thank you for the response. Please help to advise whether it is possible to proceed with the FA submission with only one pcs of the defected part and if there is any additional cost.

      Please help to advise what additional information needed if it is possible.

      • AqidAyman_Altera's avatar
        AqidAyman_Altera
        Icon for Regular Contributor rankRegular Contributor
        1 month ago

        Hi Syafril,

         

        I understand your concern and I refer your request to the internal team.

         

        Unfortunately, we can't proceed with the FA. Cyclone IV GX is a very mature product, with only one device available, the analysis would be unlikely to provide statistically meaningful or actionable information. In practical terms, a single failure on a product with this level of shipment history would not be expected to yield a valuable outcome from the FA process.

         

        Based on the symptoms you described, our preliminary assessment is that the failure was most likely caused by overstress during a previous process step. Therefore, even if we made an exception and allowed this single unit to proceed through FA, no valuable additional outcome would be expected. We would recommend considering FA if a broader failure pattern emerges, for example, if multiple units from the same batch or lot show the same symptoms.

         

        Regards,
        Aqid

  • AqidAyman_Altera's avatar
    AqidAyman_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 months ago

    Hello,

     

    Can you identify how many units that was affected? What is the failure rate?

     

    Regards,

    Aqid

    • Syafril's avatar
      Syafril
      Icon for New Contributor rankNew Contributor
      3 months ago

      Hi,

      We currently found 1 pcs affected and would like to know the cause of it.

      • AqidAyman_Altera's avatar
        AqidAyman_Altera
        Icon for Regular Contributor rankRegular Contributor
        2 months ago

        Hi Syafril,

         

        This need to be go through the Failure Analysis (FACR) to only know the cause of failure.

        However, I apologies as we can't proceed with FACR if not reaching the minimum amount of failure units.

         

        Regards,
        Aqid