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AM1806: Concerns when replacing AM1806EZWT3 with AM1806BZWT4 or AM1808EZWT3

Guru 12205 points
Part Number: AM1806

Hi,

Q1) I am using the AM1806EZWT3, but I am considering replacing it with one of the following two devices from the viewpoint of availability. Please let me know if you have any concerns about the replacement.
(i) AM1806BZWT4
(ii) AM1808EZWT3

Q2) (i) have older silicon versions, 456 MHz versions.
Are the silicon versions hardware equivalent?
Also, the 456 MHz versions have a core voltage of 1.3V, but is it possible to operate at 375 MHz with a core voltage of 1.2V?

Thanks,

Astro