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LM1086: LM1086CSX Reflow issue

Youngsu Chun
Prodigy 20 points
Part Number: LM1086

Tool/software:

Hi, Team.

We are using LM1086CSX-3.3/NOPB. During the production process, we are experiencing an issue with lead discoloration, resembling oxidation, after the reflow process.

The reflow peak temperature is set to 245°C.

After testing with three lots, discoloration occurred in all of them.

Can we conclude that the discoloration is solely due to tin plating? We are concerned about the potential reliability issues caused by the discoloration and need to take countermeasures. We have confirmed that there are no issues with the functional testing. Please let us know if the discoloration could affect the reliability of the chip. If there are no issues with reliability (or functionality), we will continue to use it as is.

Reflow Condition

1. Peak temp : 245 

2. The reflow soldering is being managed at a quality level of 2000~3000 ppm.

3. Profile Data

4. Image
5. Points to Confirm
We would like to confirm whether the discoloration issue could affect the reliability of the LM1086 component.
Thanks.
  • 0
    TI__Expert 4085 points

    Hello Youngsu,

    I will consult with our packaging specialists and will get back to you with more details when I get them.

    Regards,

    Daniel

  • 0 in reply to Daniel Esparza
    TI__Expert 4085 points

    Hello Youngsu,

    It has been observed that oxidized Sn was the reason for the discoloration. It is highly recommended to do a package shear test to validate that there is good solder joint strength.

    Best regards,

    Daniel

  • 0 in reply to Daniel Esparza
    Prodigy 20 points

    Hello Daniel,

    The soldering seems to be fine. There are no issues with the electrical characteristics.

    Can we consider this as just an aesthetic issue? We need to confirm if it could pose any problems during long-term use after mass production. I believe there may have been similar inquiries about the LM1086 product regarding this issue. I am curious to know how it was addressed.

    Thanks.

  • 0 in reply to Youngsu Chun
    TI__Expert 4085 points

    Hello Youngsu,

    Unfortunately, we do not have reports from other customers experiencing a similar problem and cannot guarantee any risk free associated with the tin oxidation. Electrically it should perform as per design, but any oxidation is related to storage and must be assessed and evaluated by the assembly house.

    The moisture sensitivity level (MSL) for the LM1086CSX-3.3/NOPB is Level-3-245C-168 HR. Please consult the MSL guidelines in this link: https://www.ti.com/lit/an/spraby1a/spraby1a.pdf

    Best regards,

    Daniel