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INA821: INA821 vs INA819: How can I choose one

Hiromu Susami
Prodigy 420 points
Part Number: INA821
Other Parts Discussed in Thread: INA819, INA826, INA827

Tool/software:

Hi experts,

I am looking for an in-amp that meets the following specifications. I checked TI.com and found that INA821 and INA819 looked good. What are the benefits of choosing each? Please let me know if there is a better product.

Comparison table

[Required specs]
Supply voltage: ±15V
Package: VSSOP (8)
Others:
　Output Voltage is almost rail-to-rail
　Low bias current 

Regards,

Hiromu

  • +1
    Guru 297210 points

    There is no similar device with lower input bias current.

    These two devices appear to be two configurations of the same device; the INA821 increases the power consumption in order to achieve lower noise.

  • +1 in reply to Clemens Ladisch
    TI__Mastermind 29936 points

    Hello Hiromu-san,

    The INA819 is slightly lower bandwidth than the INA821, and the INA819 has a higher slew rate than the INA821.

    If there are any other parameters the customer is interested in, this can help narrow down the selection. Otherwise, if the customer is looking for just these two specifications, these would be the best we have to offer.

    The INA827 and INA826 also do support +/-15V supply and can swing 50mV closer to V- than the INA819 and INA821, but otherwise are lower performance devices.

    Best,
    Jerry