Question
Are there any performance differences between the AD8421 SOIC and MSOP package
options?
Answer
There are some slight variations between specifications of the SOIC and MSOP.
In general, the choice of a package comes down to size (MSOP is smaller, and
needs a smaller footprint on the PCB), versus absolute best performance (SOIC
specs for CMRR, offset and bias current are slightly better).