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DRV8881: chip soldering

Charlie Xiao
Expert 6680 points
Part Number: DRV8881

Hi Team,

1.Is it possible to judge whether the DRV8881EPHRT is damaged by using conventional tools such as a multimeter?

2. Use a multimeter to measure the capacitance value between the pins of the chip, and find that the value is much larger than that of other chips of the same type. Does this mean that the chip is damaged?

3. Will soldering at 400°C for 30s cause short-term failure or permanent damage to the chip?

Regards,

Charlie

  • 0
    TI__Mastermind 37683 points

    Hi Charlie,

    Did you observed any abnormal or unresponsive behavior from the driver? Do you suspect the device to be damaged?

    Charlie Xiao said:
    1.Is it possible to judge whether the DRV8881EPHRT is damaged by using conventional tools such as a multimeter?

    The only risk I can think of is if the meter is sourcing current higher than what the pin can handle, it can cause damage. 

    Charlie Xiao said:
    2. Use a multimeter to measure the capacitance value between the pins of the chip, and find that the value is much larger than that of other chips of the same type. Does this mean that the chip is damaged?

    I do not believe a capacitance meter will cause device damage. 

    Charlie Xiao said:
    3. Will soldering at 400°C for 30s cause short-term failure or permanent damage to the chip?

    This answer is questioned in this E2E thread: https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1179685/drv8881-working-temperature-problem-about-drv8881prhrt

    If you are observing an issue with the driver, can you elaborate more on that. What is failing and when is this failure occurring?

    Regards,

    Pablo Armet

  • 0 in reply to Pablo Armet
    TI__Expert 6680 points

    Hi Pablo,

    Thanks for your support.

    2. I do not believe a capacitance meter will cause device damage. 

    Re: It's not that the capacitor meter caused the damage to the chip. Instead, the customer suspected that the chip had been damaged, so he measured the capacitance of the chip pin and found that the capacitance value was different from other  DRV8881EPHRT. Can it be judged that the chip has been damaged based on the fact that the capacitance value of the chip pin is different from that of other  DRV8881EPHRT?

    3. Will soldering at 400°C for 30s cause short-term failure or permanent damage to the chip?

    I think this will cause damage to the chip, right?

    Regards,

    Charlie

  • 0 in reply to Charlie Xiao
    TI__Mastermind 37683 points

    Charlie,

    Charlie Xiao said:
    Can it be judged that the chip has been damaged based on the fact that the capacitance value of the chip pin is different from that of other  DRV8881EPHRT?

    I would base it solely on the capacitance of the pin to determine if device is damaged. The best method is to measure the resistance of the pin to GND and compare it to a new working unit.

    Charlie Xiao said:
    3. Will soldering at 400°C for 30s cause short-term failure or permanent damage to the chip?

    Please refer to this appnote for information on MSL and peak reflow temperature. Section 3 and 4 would be the ones of interest. In short summary, each device comes with MSL rating/Peak reflow information in the package or you can find this information on ti.com (example below). 

    Let me know if this is clear.

    Regards,

    Pablo Armet