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求助!!求助!!购买TI的OPA277UA 本体上面的丝印K是代表什么



第一排           A BB  OPA 

  第二排           277U  K

  第三排            48A7SL

请问谁知道第二批丝印K是代表什么意思吗,有没有相关料请告知 谢谢~!!