E means industrial grade, and the temperature range of industrial grade is -40 ° C ~ 85 ° C. PA refers to in-line package chip (Plastic DIP), SA refers to patch package (SO). In addition, there is CPA and CSA suffix, C refers to the commercial grade (civil grade) temperature range is 0 ~ 70℃. In fact, these things are in the chip DATASHEET (data manual) is explained, you should be used to a chip when the Internet its data manual.