Translation - Japanese: 注文番号の E1 と E2 の違いについて - KBA217986 - Community Translated (JA)
What is the difference between E1 and E2 in the order numbers in the FR Family FR81S CY915XX series MCUs?
E1 and E2 in the order numbers indicate the composition of lead plating. While E1 indicates Bi-Sn, E2 indicates pure Sn (100%).This difference applies to the following series of FR81S MCUs:
The prefix MB of the product has been changed to CY. For instance, MB915XX has been changed to CY915XX.