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TMUX8108: Leak current

ttd
Mastermind 7920 points
Part Number: TMUX8108
Other Parts Discussed in Thread: TMUX9616, TMUX8109

Dear Technical  Support Team,

Q1

I'd like to confirm "Low input leakage: 40 pA" on datasheet page1.

Dose it mean ±15V Dual Supply on page.7?

 

Q2.

Leakage current mismatch between channels(ΔIS(ON) , ΔID(ON)) 

For Example, 85°C= 50pA, 

When IS(ON)=8nA for CH1, then 7.95nA for CH2 ?

It means difference is 50pA between CH1 and CH2.

Q3.

If you have any document(explanation) for leak current like "Leakage current mismatch between channels", please let me know.

Best Regards,

ttd

  • +1
    TI__Expert 7235 points

    Hello ttd,

    Yes, 40pA current leakage is where the device operates at ±15V Dual Supply as shown in the datasheet.

    Also yes, you are correct. Leakage current mismatch is between different channels on the device. Since the TMUX8108 is a 1-channel device this parameter doesn't correlate to it.

    Unfortunately, we don't have any documents specifically explaining leakage current mismatch between channels. 

    Best thing that I found is this documents explaining multiplexer parameters and how they are measured: https://www.ti.com/lit/an/slla471b/slla471b.pdf

    Nothing specifically about leakage current mismatch between channels.

    Thanks,

    Nir

  • 0 in reply to Nir Gilgur
    Mastermind 7920 points

    Hi Nir,

    Thank you for your reply.

    I understand leak current about TMUX8108.

    TMUX9616 has only only off leak current(IS(OFF) and ID(OFF)).

    Do you have "on leak current" and "Leakage current mismatch between channels"?

    As background to checking leak current,

    Ideally, the leakage current to GND should be less than 10 nA, since the insulation must be fairly high or measurement data will be abnormal.

    Then what leak current spec should I refer to?

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Expert 7235 points

    Hello ttd,

    I have reached out to our internal team on your request about the leakage information on the TMUX9616.

    It seems like you are looking for a high voltage device with low current leakage am I correct?

    If that is the case, can you please specify what are the voltage levels and current leakage parameters you are looking for and I will try to provide the best recommendation I have. 

    I will follow up with what information I got from our team about your TMUX9616 concerns as well. 

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Mastermind 7920 points

    Hi Nir,

    Thanks for sharing with your team.
    I am looking for high voltage devices with low leakage current below a few 10nA, I need more than DC ±100V, I'm investigating
    TMUX9616,TMUX8108 which I believe would be the max voltage product group.

    Best Regards,

    ttd

  • 0 in reply to ttd
    Mastermind 7920 points

    Hi Nir,

    I understand that  "Leakage current mismatch between channels" is only for TMUX8109 between CHA and CHB.

    This spec is NOT for TMUX8108 between S1 and S2 ・・・S8.

     
    Is it correct?

    You said:

    Leakage current mismatch is between different channels on the device. Since the TMUX8108 is a 1-channel device this parameter doesn't correlate to it.

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Expert 7235 points

    Hello ttd,

    Ok I see, for your request the best device I can recommend is the TMUX9616 as you already mentioned. 

    I have received a response from our internal team. The on leakage current spec will be equal to the off leakage. On leakage isn't measured on the device because of the effect of the bleeder resistors. They would overtake any sort of internal on leakage. But in theory they are equal in value, which is around 70nA in typical settings. 

    I understand you are looking for a switch with below 10nA leakage, but the TMUX9616 is the best option we have for your request. 

    Yes, current mismatch is between the channels of the device, not between the source pins. The TMUX8108 is 8:1 1-channel device. Current mismatch between channels is not correlated to it because it only has one channel. It is correlated to the TMUX8109 because it is a 4:1 2-channel.

    Thanks,

    Nir