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OPA627: OPA627AP Product problem

yingjiao LI
Expert 1035 points
Part Number: OPA627

Tool/software:

Hi

We made X-ray structure of this product and found that the internal structure was inconsistent and the appearance was different
Could you please help to confirm the reason and whether it affects the use
thank you

  • 0
    Guru 272870 points

    Did you acquire them from an authorized distributor? (The OPA627AP was discontinued, so now the only source is Rochester Electronics.)

    If not, then one or both are likely to be fake.

  • 0
    TI__Guru 54261 points

    Hi Yingjiao,

    As Clemens indicated, OPA627A was discontinued. If the IC is not purchased from TI authorized distributor, we have no ways to provide the traceability on these parts. 

    OPA627AU package (SOIC) is still active, I can find out when you are able to purchase these. You may have to make or purchase adapter from SOIC to DIP package, or find alternative part to replace it (difficult for DIP package). 

    Please let me know if you need further assistant. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    TI__Guru 54261 points

    Hi Yingjiao,

    FYI, OPA627AU part is still active, though it is out of stock currently. 

    If you are interested, I can find out when it will be available. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Expert 1035 points

    Hi

    Could you please help to confirm why the internal structure on the pictures we feedback is different, and why the appearance is also a little different

  • 0 in reply to yingjiao LI
    Guru 272870 points

    You did not answer my question. Where did you acquire them from?

    The OPA627 is a well-known audio opamp, and the DIP package was discontinued. This makes it very likely that both are counterfeit, and that the electrical characteristics will be different.

    The only way to get an OPA627 now that is guaranteed to work is to

    • buy the OPA627AP from Rochester Electronics; or
    • buy the OPA627AU from TI or an authorized distributor, and use a SOIC-to-DIP adapter.
  • 0 in reply to Clemens Ladisch
    Expert 1035 points

    Hi
    We got it from Rochester

  • 0 in reply to yingjiao LI
    TI__Guru 54261 points

    Hi Yingjiao,

    Let me get it back to you on this.  

    There are many counterfeits on the part. I normally do not deal with Rochester Electronics, and I do not know where they acquired these ICs from. I need to contact the engineer who works with the distributor.

    The SOIC to DIP adapter looks like this. You may consider to work around the issue. I was told that OPA627AU may be available soon.   

     

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    TI__Guru 54261 points

    Hi Yingjiao,

    yingjiao LI said:
    the appearance was different
    Could you please help to confirm the reason and whether it affects the use

    If these OPA627 PDIP packages were purchased from Rochester Electronics, who is one of the authorized TI distributor, it is likely that these parts are authentic. 

    I compared the wire bonding patterns, and it seems that two parts are identical. The X-ray images reveal some dark and light grey scales, it is possible that these are due to the differences shown in the paragraph below. In addition, the OPA627 physical outer markings do show the correct product patterns that defined in the product.

    Please complete the counterfeit request form form and submit it to our customer support center. We are the technical support application team, and do not support the sample returns and counterfeit request process.   

    https://www.ti.com/lit/ml/ssdl004c/ssdl004c.pdf

    https://ticsc.service-now.com/csm?_ticdt=MTY2MzMzNjU2N3wwMTgxNzE3M2QzZDEwMDA4ZjgwNzE4OGU5MmNkMDUwNmYwMDFiMDY3MDA3ZTh8R0ExLjIuMTIxNTA1NTM1MS4xNjU1NDY1ODI2

    If you have additional questions, please let us know. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Expert 1035 points

    Hi
    If the origin is different, the internal structure will be different

  • 0 in reply to yingjiao LI
    TI__Guru 54261 points

    Hi Yingjiao,

    Yes, the manufacture site is different. The X-day image show that it has the same die. I don't believe that the darker area is the Si die; it is likely air pocket or stress relief layer to lower the epoxy molding stress onto the Si die surface. the bonding pad is where the Si die resides, which is below the darker grey layer. 

    Please submit the counterfeit request form, and this matter should be resolved by the customer support team. I do not have the knowledge how to proceed the matter. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Expert 1035 points

    Hi

    When you say dark region anomaly, you mean the image

  • 0 in reply to yingjiao LI
    TI__Guru 54261 points

    Hi Yingjiao,

    The dark region is shown in red. I do not know exactly what it is in it, but it is possible a piece of stress relief thin plastic layer, which is used to avoid direct contact of the epoxy cured molding compounds.   

    If these were ordered from Rochester Electronics, they are likely authentic. 

    If you have other questions, please let us know. 

    Best,

    Raymond