We often get questions wondering what the difference is between the CPF0402B40R2E and CPF0402B40R2E1 chip resistors from TE Connectivity Passive Product. I reached out to TE for clarification and they said the only difference between these two parts is the packaging. The CPF0402B40R2E is shipped to us on reels of 5,000, while the CPF0402B40R2E1 is shipped to us on reels of 1,000. The specifications for the parts are the same otherwise.