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INA828: IN828 vs. INA818

Dennis Smith
Prodigy 10 points
Part Number: INA828
Other Parts Discussed in Thread: INA818, INA118, INA819, INA826

Tool/software:

We have a circuit that previously used a competing device the LT1167A. To increase Overvoltage and ESD protection we switched to the INA818 since it had identical pinout. The INA818 has become difficult to source so we thought we would switch to the INA828. However, when we substitute this part in the same exact circuit the circuit ceases to function. Can you comment and/or provide a substitute for the INA818 with input ESD protection that would work in our circuit. The INA828 from a pinout perspective appears identical to the INA818 so we are wondering why it does not function similarly.2400034_B.2_0.pdf

  • 0
    TI__Mastermind 32941 points

    Hello Dennis,

    There is very little difference between the INA818 and INA828. The INA818 is an update to the older INA118, but the INA118 may work in your application if the INA828 is not working, and has plenty of stock.

    Could you provide some more information on your application? What supply voltage are you using? Additionally, by ceasing to function, do you mean there is no output, or there is an incorrect output? It looks like your reference voltage has a significant amount of impedance, which will result not only in a CMRR degradation, but a gain error as well.

    I've provided below a parametric search for all of our instrumentation amplifiers in 8 pin SOIC that have EOS protection. Unfortunately, we do not have a filter for what pins RG is on, but I have a short list of devices that are not P2P for this application. The devices that are in this filtered list that are not P2P will be the INA819 and INA826, all other devices on this list will be P2P. 

    https://www.ti.com/product-category/amplifiers/instrumentation/products.html#2192=Overvoltage%20protection&2954=SOIC&2955=8&358max=36%3B50&  

    Best,
    Gerasimos