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SN74LVC1G17: SN74LVC1G17DCKR 为什么同一个型号 同一年份同一产地 出现的X光射线不同?

Part Number: SN74LVC1G17

各位大神,麻烦看下这个型号 SN74LVC1G17DCKR ,为什么同个型号 同批次同产地  会出现不同的X光射线?是晶圆问题还是本身原厂芯片设置如此