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TMUX1204: Is the TMUX1204 can mux current sources?

Part Number: TMUX1204
Other Parts Discussed in Thread: TMUX1208, TMUX1209


Hello experts:

is the analog mux TMUX1204 can mux current sources as well?

I am about to use several TMUX1204 chips in a new data logger design. I have to mux few sensors which provide 4-20mA data. I would like to select sensor's data by the mux before converting it to a measured voltage. (using 100 ohm resistor).
Is that analog mux enabling currents muxing as nice as  muxing voltages?
If not, any suggestions?

  • Hi Dan,

    The analog mux/switch products are passive switches and allow either voltage or current to transfer efficiently when the channel is ON. This is a standard use case.

    The device allows upto +/-30mA of continuous current reliably through the switch as shown in the absolute maximum rating table.

    We also offer higher channel count variants based on the system requirement. If you have to sample 8 sensors at a time through a single ADC, we have 8:1 switches like the TMUX1208 and a 2ch 4:1 switch like the TMUX1209 if sampling differential signals.

    Hope this helps.

    Thank you,


  • This will work. The switch can pass any signal with a voltage between 0 V and VDD. It behaves like a 9 Ω resistor, so 20 mA will result in a voltage drop of 180 mV.

  • Hello,

    Thanks for your reply to my question.

    As I understand, If my current source (sensor) source 10 mA as data, I can have the 10 mA at the output of the mux when I address that source...

    If so, it help me very much to go on with my initial design...