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请求帮助,目前购买了一批OPA277UA,但是芯片上面丝印为277U K 具体描述如下!

第一排 A  BB  OPA

第二排 277U K

第三排 48A7SL

第二排丝印有个K请问有知道是什么含义吗,或者有相关资料的麻烦告知一下,不胜感激,