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TLC2652: Device Marking of TLC2652

Norman Werner
Prodigy 60 points
Part Number: TLC2652

Hello,

We use a TLC2652AC in one of our designs. Currently we have a batch of assemblies with higher than normal error.

The IC have the the following marking:

TLC2652AC

TI-LOGO 3AM

AKRD

Another good performing batch has IC with the marking:

TLC2652AC

TI-LOGO 3AM

AKRE

So my question is: What does AKRE vs AKRD stand for.

Thanks in advance

Norman

  • 0
    TI__Guru 54341 points

    Hi Norman,

    Q; What does AKRE vs AKRD stand for.

    AKRE and AKRD markings refer to the unique lot trace code identifier. These are used for internal traceability purposes only. 

    In addition, the marking appear to indicate the material is from 2013 and may be from a 3rd party.

    Please provide us with the internal supply chain and distributors. If you want to keep the information private, please request friendship link via E2E private message. Once we establish the contacts via private message, we are able to exchange message privately. The current message is in public forum, which everyone is able to read, if it is found. 

    BTW, since some of parts are dated back in 2013, I was wondering if you attempted to bake the ICs prior to reflow process. If internal IC molding compounds absorb certain level of moisture, it may cause the internal damage due to trapped moisture inside of IC package when the parts are exposed to high heating rate profile under the reflow process. It these parts are stored under higher humidity or temperature environment for a period of time, moisture may be absorbed within the iC package. Please see the AN-2029 IPC/JEDEC J-STD-033D recommendation. 

    https://www.ti.com/lit/an/snoa550h/snoa550h.pdf?ts=1599667738235&ref_url=https%253A%252F%252Fwww.google.com%252F

    Best,

    Raymond

     

  • 0 in reply to Raymond Zhang1
    Prodigy 60 points

    Thank you for your answer.

    I just wanted to doublecheck that not some obvious counterfeit copies were used.

    Apparently at least the devicemarkings are perfectly legit.

    Currently I can't prove that the IC are out of spec in any way and I certainly didn't want to imply anything related.

    In the whole system system consisting of amplifier, passives, software and layout the amplifier appearsto be the most unlikely point of failure.

    I am currently investigating this issue and did some further experiments - a lot of evidence  points to some seldom triggered software bug.

    Norman