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请教下IC上的数字和字母代表的意义

Other Parts Discussed in Thread: LM2902

例如在LM2902上,有06C4R2这几个字母,是代表的这个芯片的的生产批号么,如果是的话,生产日期又是什么时候呢?TI的其他芯片的除芯片名称外的字母数字又各代表什么意思呢?麻烦告诉下,谢谢