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AM26LS31: Possible to have two different Lot# in one reel? same date code AM26LS31

Part Number: AM26LS31

Hello,

i faced once problem during production. we found out two different Lot code in one reel (same DC). and It was not in order.

and also fuctional defect occured with Lot# 03APZCK

Lot : 03A183K, 03APZCK

The order of SMT production: U14 -> U13 -> U16 -> U18   : 03A183K > 03APZCK > 03A183K > 03APZCK

here is my question.

is it normally happened? if so can you explain the reason that how could two Lot# mixed alternately. and one Lot occuring functional issue.

because of this we all stop our prodution, waiting for your feedback as soon as possilbe.