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CD4051B-Q1: What if Input voltage far exceeds the supply voltage in a short period of time?

Alix Wan
Genius 9995 points
Part Number: CD4051B-Q1
Other Parts Discussed in Thread: TPS54160, TIC12400-Q1

Hi team,

My customer is evaluating CD4051-Q1 for BCM project. Considering that the Vin may exceeds 30V for a t<400ms period of time:

1. Will the MUX be damaged?

2. If not, will the device need to be restarted to go back to normal operation?

In addition, if Vdd exceeds 30V in a short period time (t<400ms), will the mux be damaged?

Thanks ahead for your strong support!

  • 0
    TI__Intellectual 2900 points
    Hello Alix,

    CD4051B-Q1’s recommended max Vcc is 18V. In other words, it is not able to handle any transient event higher than 18V.

    In your 18V case, I think you are implying truck battery. As you suggested cranking case, the transient event can cause 40V overshoot.

    None of the TI MUX has been optimized for cranking supply.


    I would like to propose two other solutions.

    1. Add a DC/DC, TPS54160 for example, to deal with battery cranking.

    2. Use TIC12400-Q1. It is so specificated that it can take 24 channel inputs and its supply pin can handle car’s and truck’s battery directly. It also has on-chip ADC, comparator and digital core.