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It all depends on your application. ISO7141CC would be a good replacement, but the ISO7741 is probably even better suited for your application. It has higher isolation, stronger CMTI, wider supply range, and better immunity and robustness. I would recommend the ISO7741. If you look in the ISO7741 datasheet, Section 9.2 Typical Application shows an isolated serial peripheral interface (SPI). [This can be found on page 26 of the datasheet.]
If you also require isolated power, check out the ISOW78xx line of isolators.
If you have any other questions please let me know!
