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TMUX1108: Analog switch for multiple NTCs

Amy Luo
Expert 6890 points
Other Parts Discussed in Thread: TMUX1108

Hi Team,

Customers need an analog switch to collect 8 channels NTC temperature signals.The NTC temperature signals in each channel are differential signals.Two signals in the differential signal need to be switched at the same time. 5V power supply.You can understand the customer's needs through the following picture.I haven't found the right product on TI's official website. Do you have any suggestions?

  • 0
    TI__Expert 3900 points

    Hi Amy,

    What is driving the need for 8 channels of NTCs?

    From your image it appears you need and 8:1, device with 2-channels. Using the selection table I was able to find the CD4097B. However, the on resistance can be as high as 1KΩ. Which may not be acceptable. 

    I would recommend using two TMUX1108 devices. This is a single channel 8:1 mux, and using two allows for differential switching if you connect the logic controls together. This device has very low 5Ω of on resistance at 5V and comes in a small QFN package of 4.68mm² if size is important to the customer.