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TPD4E110: Typical leakage current

Edward White
Prodigy 10 points
Part Number: TPD4E110
Other Parts Discussed in Thread: TPD4E1B06

Hello,

We are building an EEG device using a TI AFE, so input leakage current is critical to our application. We're currently looking into two ESD parts by TI - TPD4E110 & TPD4E1B06. The latter has a better maximum leakage current specification (0.5 vs 1 nA), however the former has a "typical" leakage of just 20 pA! Could you provide a histogram or general guidance on the distribution of the TPD4E110's leakage current? How was this typical value arrived at? Likewise, no "typical" leakage is specified for the TPD4E1B06, so more information on this part would be very helpful for us to compare the two devices. 

Thank you!

Edward

  • 0
    TI__Mastermind 18010 points

    Hi Edward,

    The leakage current is measured at the input across multiple units to provide a typical value that would acuurately represent the devices across different lots. The typical value is what you will likely see on the bench while the max value is more of a guard banded spec. The TPD4E1B06 will have better leakage across temperature but the typical leakage of TPD4E110 will be slightly lower. 

    Here are the leakage curves over temperature for TPD4E110  and TPD4E1B06.

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Prodigy 10 points

    Hey Sebastian, thanks for the quick response! Yes I understand what typical means, however how useful it is really depends on the testing method (sample size, mean or median, etc) and the distribution of the value. Could you share the histogram plots or the raw data of the leakage current measured across multiple units? Or even some insight to how many units were samples, the average and the variance of the resulting data. I would like to understand how conservative the max value is for each of these products, along with seeing how much variance we can expect between products.

    And based on the graphs from the datasheets, it seems to me that the TPD4E1B06 has lower leakage at 25 degrees Celsius, so how come you suggest the TPD4E110 will have slightly lower leakage? 

  • +1 in reply to Edward White
    TI__Mastermind 18010 points

    Hi Edward,

    The leakage current for both devices will be below 10pA based off the graphs, TPD4E1B06 does seem to have slightly lower leakage by a few pA at room temp.What is the required leakage current for this application?

    Our test methods and sample sizes are proprietary information but I would recommend the TPD4E1B06 since it has better leakage performance overall. 

    Regards,

    Sebastian