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TS3USB31ERSER Reliability

Elizabeth Russell
Prodigy 220 points

I am using the TS3USB31ERSER and have found a greater than expected failure rate of either one switch or the other. From the USB connector the VBUS and GND signals each pass through a ferrite bead. The VBUS (post ferrite bead), D+,  and D- signals are connected to a TPD4S012DRYR and then to the TS3USB31ERSER. The USB switches work well enough to get through assembly testing, but some have failed final testing. One possibility is that there was ESD damage during final testing. I did a fair amount of ESD testing during the design phase and never had a problem. The failure is that the switch remains open even when the enable signal is asserted. Does anyone have any suggestions as to what might be happening?

Thanks,

Elizabeth

  • 0
    TI__Genius 9860 points

    What is the failure rate? And do you have scope shots of what happens when you toggle the enable signal?

     

    -Ryan

  • 0 in reply to C. Ryan Land
    Prodigy 220 points

    Thanks for your reply. The failure so far has been 6 out 400. Five of those 6 were repaired (by replacing the part) before I could see them. The one I have has a problem with the D+ switch only. The voltage at the input to the switch (from the circuit side) is about 3V and, with the switch disabled, the voltage at the output of the switch (USB connector side) is about 0V. Upon enabling the switch (the enable pin is toggled from 2.85V to 0V), the voltage at the output of switch is about 1.3V as if the switch is only partially opened.

    Elizabeth

  • 0 in reply to Elizabeth Russell
    TI__Genius 9860 points

    Hi Elizabeth,

    One possible risk of damaging the part (by violating the absolute maximum ratings) is if the HSD+ / HSD- pins have input > 0.3V before Vcc is applied. How does the final testing procedure differ from assembly testing?


    If you would like to initiate a failure analysis on the failed part, you can do this through the channel through which your purchased the parts (distributor, etc).


    -Ryan