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LMV358: LMV358ID cracking or broken pin issue

Takashi Matsumura
Intellectual 795 points
Part Number: LMV358

Hi TI Team,

Thank you for your support.

One customer purchased 75 pcs for LMV358ID.

But Pin are cracking or broken for serval pcs.

It's old chips and out of warranty I belive.

Date Code
1740+5
Lot#
0037009ML7

I'm requesting soldering profile from him.

But the question is,

*Did you hear any similar issue like this?

Could you give some advice?

Kind Regards,

Takashi

  • 0
    TI__Genius 12810 points

    Hi Matsumura-san, 

    When are the pins cracking and breaking and how many? Is the customer re-assembling (de-soldering and soldering) the parts multiple times? And if so, what is their process? 

    Thank you!
    Best Regards,
    Ashley

  • 0
    Intellectual 795 points

    Hi Kang-san,

    I got Reply from the customer.

    Process is.

    　Printer　→　Mounting　→　Reflow　→　Wave　→　Hand solder for required parts.

    It seems like Customer dip them to the Soldering pot after reflow.

    1. Reflow

    Preheat 140℃～160℃　：11.15～19.32 Sec.

    Peak 219.62℃～223.61℃　

    2.  Solder bath

    Preheat：110℃　PH Time 7 Sec.

    Solder tEMP：250℃　DIP time 6 Sec.

     

    ③ Manual Soldering

    When needed  350℃ But He didn't use for it.

    The customer was having issue for 5 of 75pcs.

    1 clacking and 4 of them are pins were broken.

     

    Could you give some advice?

    Kind Regards,

    Takashi

  • +1 in reply to Takashi Matsumura
    TI__Mastermind 19612 points

    Hello Matsumura-san,

    Please ask them to slow down the pre-heat/soak time. As seen in the MSL document, the soak time can affect the IC reliability: 

    In the TI document, the temperature is ramped up from 150C to 200C in 60 seconds to 120 seconds, this is a ratio of 0.83 C/sec to 0.416 C/sec. 
    The customer is changing 140C to 160C in "11.15～19.32 Sec.", this is a ratio of 1.79 C/sec to 1.03 C/sec. 

    Therefore the customer is ramping the soak time too quickly. 
    Please let us know if this fixes the issue. 

    All the best,
    Carolina

  • 0 in reply to Caro Walter
    Intellectual 795 points

    Hi Walter-san,

    Thank you so much.

    I still didn't get reply from the customer. But, I think this is the great answer and problem is there which I never think about it. (So as customer)

    I will let you know when customer give us the result.

    Kind Regards,

    Takashi