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SN74HC164: 型号尾缀差别

Part Number: SN74HC164

SN74HC164DRG3

SN74HC164DRG4

SN74HC164DR

您好,这个几个不同尾缀,同样封装的型号,主要什么差异?只要引脚涂层不一样吗?是否都符合ROHS标准?使用时上有什么差异吗?