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TPS7B81-Q1: TPS7B8150QDGNRQ1 reflow condition - preheat time

Hiroyuki Masada
Prodigy 90 points
Part Number: TPS7B81-Q1

TI guidline for preheat time is 60sec~120sec from 150degC to 200degC. 

BUt cusotmer is asking if TPS7B8150QDGNRQ1 can accept 150sec preheat time from 160degC to 190degC or not.

Could you please answer ? 

  • 0
    TI__Genius 10240 points

    Hello,

    Thank you for your question.

    Please allow me 2-3 business days to respond to your question.

    Best Regards,

    Hannah

  • 0
    TI__Genius 10240 points

    According to the TI representation of the J-STD-020, it seems like max preheat time up to 120 seconds. This time is in compliance with the J-STD-020, which is standardized across the industry. To remain IPC/JEDEC compliant, you must stay within the time limits specified.  

    Please see MSL Ratings and Reflow Profiles (Rev. A) for additional information on reflow profiles. 

  • +1
    TI__Intellectual 1550 points

    Assuming this is a one time exposure, the 150 seconds of a preheat from 160C to 190C instead of a 120 seconds JEDEC maximum should be acceptable. A longer time in the preheat should allow the IC to stablize before the more harsher reflow portion of the SMT profile. 

    Note that during an IC qualification, we would submit it to 3x reflow cycles so our devices have shown it can survive to 3 exposures to such JEDEC preheat times.

  • 0 in reply to Allan Webber
    TI__Genius 10240 points

    Hello Allan,

    Thank you for clarifying JEDEC preheat times based on TI IC qualification. Please feel free to let the customer know that it is okay to proceed with their system. I will be closing this thread now.

    Best Regards,

    Hannah