LMP8603: Alternative with higher better CMRR?

Stefan Lintner

Part Number: LMP8603
Other Parts Discussed in Thread: INA286, INA240, INA270

Hi Team,

I am looking for a pin compatible LMP8603 (VSSOP package) device with the same internal 2^nd order filter, but with much better CMRR figures like for the INA240/INA286.

What would you recommend here?

BR,
Stefan

over 2 years ago

+1 Joseph Scherphorn over 2 years ago

TI__Intellectual 760 points

Hello Stefan,

Thank you for your question and using the E2E forum.

Current sense catalog can be searched and filtered here(can filter by package and sort by CMRR):

Current sense amplifiers product selection | TI.com

That being said INA270/271 is only device with same topology and access to second stage to implement filter same as LMP8603 that could still buy you something on CMRR. Typical value for CMRR on this device is characterized at 84db but if you look at characterization of CMRR over temp (7.5) you'll notice device is characterized with 100 db CMRR min across the tighter voltage range specified.

INA271 data sheet, product information and support | TI.com

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LMP8603: Alternative with higher better CMRR?