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【求答案】LMC6042AIN上标的JR99ABE3是什么意思

追问,像NS  的  LMC6042AIN这类芯片 ,插件的封装表面标识的第一行是什么意思,比如LMC6042AIN 有标 JR12ABE3,也有标JR99ABE3,还有JR03ABE3 的。不知道是什么意思?谢谢