When looking at Onsemi - EEPROM products, you may see some part numbers with “JN” suffix, such as CAT25040VI-GT3JN and CAT25080YI-GT3JN. The datasheet does not call out a meaning for this suffix.
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Please note that there is no functional difference between the part numbers with and without JN (such as CAT25080YI-GT3JN vs CAT25080YI-GT3)
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JN: supplier internal code that no functional implication