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SN74TVC3306: A2/A3 High Voltage Consult

Part Number: SN74TVC3306

Hi Team, 

As D/S states, when A2/A3 voltage is higher than Vref, the voltage clamping is working. Customer is asking whether it's okay for letting the high voltage level of A2/A3 equal to Vref(A1), which is shown in below screenshot? Pls help us clarify it. Thanks. 



  • Yes. The A2/A3 pins can have any voltage between 0 V and 5 V.

  • Hi Clemens,

    But our D/S states that only A2/A3 voltage higher than Vref, voltage clamping can be effective. How to understand this here? Thanks.

  • When the voltage at A2/A3 is below VREF, the pass transistors are on, and the B2/B3 pins have the same voltage.

    When the voltage at A2/A3 is above VREF, the pass transistors are off, and the voltage at the B2/B3 pins is determined by the pull-up resistors.

  • Hey Stanley,

    Could you help clarify more on what is being asked here? Based on the image where you've boxed the Vref and B2/B3, I believe the true question here is about the functionality and how the Vref, A2/A3 and B2/B3 interact. The Vref will set some threshold level. When A2/A3 is below the threshold, you'll see the A2/A3 voltage on the output. When A2/A3 are above the Vref threshold, the device will clamp and your B2/B3 will be pulled up to whatever value pull up you have on the output.
    Let me know if this helped clarify anything or if I can be of more help.