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Hello,
The E4 and G4 use to mean lead free. We don't use these designations anymore since all of our products are lead free. This is just a legacy identifier. On the product page you can see it says "Same as:" below.
U and UA have different specification listed in the product datasheet.
For additional information please see the links below.
https://www.ti.com/support-quality/environmental-info/logo-product-labeling.html
https://www.ti.com/support-quality/environmental-info/environmental-home.html
Best Regards,
Chris Featherstone
