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LM2903QDR关于管脚的问题

之前在ARROW订购了一批LM2903QDR  1714+的批号 客户收到之后反馈管脚发黑 怀疑是氧化,发回收到 认为应该是铜脚 帮看下图片是否是铜脚 如是铜脚在PDF哪个地方会说明有铜脚,谢谢!