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TMUX1108: Analysis of A0 pin short circuit

Rain Wang
Expert 1400 points
Part Number: TMUX1108

Hi TI

The customer uses this chip, which is powered by 5.3V, and the address pin level is normally controlled by 3.3V. Six pieces have been welded, and one piece has a short circuit between A0 and GND. Please help to analyze the possible causes, thank you.

     

  • 0
    TI__Genius 10552 points

    Hi Rain,

    Have you tried using a different mux in place of the one experiencing the short circuit? If a different mux solves the issue then we could be looking at a specific part issue, especially if all the other soldered parts are working fine. It appears that this part could have been fried due to a potential over voltage event thus frying the ESD cell and giving us a short circuit event. 

    Thanks!

    Alex

  • 0 in reply to Alex Vish
    Expert 1400 points

    Hi  Alex

    Additional information:

    the chip has no problem with initial power-on. There is a short circuit during use.

    A0 pin and EN pin are both short circuited.

    Could you help me analyze whether it is caused by pin overvoltage? There is no problem with input and output Pin.

  • 0 in reply to Rain Wang
    Expert 1400 points

    add：The problem disappears after replacing the chip

  • 0 in reply to Rain Wang
    TI__Genius 10552 points

    Hi Rain,

    Thanks for providing this additional information. Since the problem disappears after replacing the chip then this is indicative of an overvoltage event that caused a short between A0 and GND. Since the problem has disappeared with a replacement I will close this thread. Please let me know if you continue to experience issues with this specific device. 

    Thanks!

    Alex