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Original question:

TMUX4051: Graphs of leakage current vs. tempersature and charge injection vs. source voltage

TMUX4051: TMUX4051

Wim M
Prodigy 75 points
Part Number: TMUX4051
Other Parts Discussed in Thread: TMUX1108, TMUX1308

Hi,

I am looking for a 4051 multiplexer with low leakage current at the analog switches and the TMUX4051 could be useful.

The datasheet shows the leakage currents at 24V (800nA @ 85°C). In our application VDD=5V and VSS=GND=0V.

Is there data available on the leakage current at 5V and 85°C? If the currents are lower than 200 nA, the device is usable.

Thanks in advance,

Wim

  • 0
    TI__Genius 13220 points

    Hello 

    Thanks for sending this message.

    We will give an update on this question tomorrow

    Regards!

  • 0
    Guru 265270 points

    Here is a search for 5 V, 1:8 switches with an on-state leakage of no more than 200 nA: ti.com/switches-multiplexers/analog/products.html#1143=8:1&3306=5&3193max=0.0004;0.2

    You probably want the TMUX1108 with < 1 nA. (It does not have the 4051 pinout.)

  • 0 in reply to Clemens Ladisch
    Prodigy 75 points

    Hi Clemens,

    The electrical spec's are ok. However the pinout must be the same as the 4051 because it is used on several excisting PCB's.

    Hence the question about the leakage current at 5V for the TMUX4051.

  • 0 in reply to Wim M
    TI__Genius 13220 points

    Hello Wim,

    Looking into our team validation data, the on leakage current for this device at 5v single supply is lower than 200na. @85c

    Please let me know if you have any additional questions!

    Regards,

    Kameron

  • 0 in reply to Kameron Hill
    Prodigy 75 points

    Hello Kameron,

    Can you provide the validation data on leakage current for the  TMUX4051?

    I also found the TMUX1308 (45nA@85°C) and I found this device does NOT have internal clamp diode from analog input to VDD. In our application the mux switches between several external 0-10V signals. These signals have a TVS and a voltage divider of 22kΩ and 10kΩ ( 10/32 * 10V = 3.125V at mux pin). When the power is switched off, the TMUX1308 VDD=0V, but the 10V remains. Can the analog inputs handle this situation? I assume the internal fet cannot shunt the input to GND in this situation.

    Regards, Wim

  • 0 in reply to Wim M
    TI__Genius 13220 points

    Hello Wim,

    1.Please email me offline so that I can send the validation data as it is internally shared info.

    2.It sounds like your customer is trying to run voltage on the I/O pin while the device is turned off. This device is not power off protected so you should expect to see the signal on the output. We don't guarantee any performance or that we won't be damaging the device since this will be outside of the datasheet specifications. I dont see any devices that are 8:1 1 channel that can handle a 5v supply in normal operation but lets discuss offline

    Can you tell me more about this business case  and the use case for this device in your system?

    Regards,

    Kameron