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LM393: 为什么新型裸片和经典裸片共用一个Vendor PN,而不是各自有自己的PN

Part Number: LM393

Dear TI:

      LM393DR 为什么新型裸片和经典裸片共用一个Vendor PN,而不是各自有自己的PN。两种不同的裸片功能上已经有差异,为什么用的还是同一个PN呢?谢谢。