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RC4580: The problem of exposed copper pins for RC4580

Zhang Liang
Expert 2635 points
Part Number: RC4580

Tool/software:

Hi,

Our end customer relesae the order of RC4580TPWR to us and the good has some appearance issues, customer QE feedback 20pcs/ 20pcs all have this issue, please refer to below picture:

They want to know below:

1. Is this the quality problem or normal?

2. If this is the quality problem, we need to submit the FAR to TI CQE, right?

3. How long of the exposed copper pin to oxidize(CuO)?

  • 0
    TI__Genius 9776 points

    Hi Zhang,

    I understand that this characteristic of the leadframe may be concerning, but this is not a quality problem.

    When the leadframe is molded, some packages will have what is called a tie-bar connecting the individual pins together in metal. These tie-bars are mechanically removed at some point in the manufacturing process, and this can sometimes leave behind an area which does not have the same amount of plating as the rest of the leadframe. 

    Understand however that this does not affect solderability or functionality. We have qualified this device to JEDEC standards, and the slightly exposed portion of copper is not uncommon to see in other IC's.

    I am unfortunately not able to speak on oxidation of the copper. It is possible that over a long period of time in the right conditions you may see some slight color change on the small surface which is exposed to air. Even still, this change would not affect the functionality of the device.

    Please let me know if you have any questions,

    Best,

    Jacob