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INA321 Footprint Compatible Replacement

Other Parts Discussed in Thread: INA333, INA321, INA337, INA338, INA327, INA326

Is there a footprint compatible replacement for the INA321 with a lower input offset voltage?  I've looked at the INA333 which is very close but would require circuit modifications.  Trying to target .2mV max input offset but anything less than the INA321 would be beneficial.

  • Hello Mike,

    The short answer to your question is no, we do not have any pin-for-pin compatible devices with less initial input offset voltage. 

    However, I recommend also taking a look at the INA326/7 and INA337/8.  They will both require some PCB modifications.  The INA326 and INA337 come in MSOP-8 packages.  The INA327 and INA338 are in MSOP-10 packages for the have an enable, which is probably more similar to what you're looking for.

    On a side note, if you do switch to the INA326/7 or INA337/8, please be sure to minimize parasitic capacitance on the gain-setting pins.  They are sensitive to such capacitance due to their unique topology.

    Please let me know if you have any further questions.

  • Thanks for the response.  That's what I was finding but wanted to make sure I didn't miss anything.