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LM1117: 管脚异色

Part Number: LM1117

我司制程反馈贵司提供的LM1117IMPX-ADJ/NOPB炉后异色(见下图),不良批次:2436(料盘信息见附件);该批次问题概率50%左右,更换批次后异常消失;请原厂分析变色原因。