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OPA177的型号里有带E4、G4的，有不带的，请问这三种的区别在哪里？谢谢！
带E4 G4是指环保等级，不带的表示暂时无环保等级。
以前G4，E4代表的是绿色环保，符合ROHS标准等，现在带E4,G4的和不带的已经没什么区别了，基本上都是绿色环保产品了。
