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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/1054905/sn74ls377-pins-looks-like-be-oxidized
这不是氧化。 大多数采用 DIP 封装的器件都具有粗糙的引线框；请参阅 [常见问题解答]为什么引线框看起来严重氧化或腐蚀？
显然、您从两个生产流程中获得的芯片具有不同量的酸粗糙度。
