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Original question:

[FAQ] How do Instrumentation Amplifiers (INAs) fit into my design?

Selecting Proper Instrumentation Amplifier

Zack_Saigh
Prodigy 100 points
Other Parts Discussed in Thread: INA821, INA129

I have been looking around at some of the offerings for Instrumentation and even general purpose Op-Amps.


Due to some of the price disparities, I am concerned I am possibly overlooking something


I want to amplify a low voltage signal (uVolts)  that would be fairly low in frequency.  (Power Consumption is also not a factor);  No power supply rail constraints either.

For Example, I was looking at the INA129 initially, this part is approx $17 a piece, then I recently started looking at the INA821 (Approx $2.5); 

The INA821 seems to beat the INA129 in all the advertised specs, except for possibly having the option to configure it for higher gain.



Any reasons for the price disparity?  What are the pitfalls of these newer INA8** Series Amps?

These also seem cheaper than some of the general purpose Op-Amps I am looking at as well.

Any insight into this would be greatly appreciated!



Thanks,

Zack

  • 0
    Guru 140200 points

    Hi Zack,

    the price of a chip not only depends on accuracy and precision. It's not unusual that an older chip is becomming more and more expensive over the years because the manufacturer wants you to take a newer chip. This could be the case here with the INA129 and INA821.

    Kai

  • 0
    TI__Genius 10850 points

    Hi Zack,

    Good question. As we continue to develop and release newer parts on new process technologies, we are able to get competitive on pricing. The INA129 is a really old device developed on an older process technology which intrinsically commands a higher price to build and therefore sell. 

    Hope that helps.

    -Tamara Alani