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您好,
G3、G4都是环保标准是“绿色”的,现在 TI 的所有设备都是"绿色"的,但保留了旧的指示符,是因为许多客户仍使用这些型号订购,具体查看下面FAQ:
[FAQ] Why does a logic device's part number have an E4/G4 suffix?
SN74HC08DRG3是在TI购买的吗?因为在TI数据表中没有这个Orderable Device(可订购产品),如下截图,有SN74HC08DRG4的:
尾缀G4产品不能正常工作吗?管脚颜色发暗,这应该是TI对 管脚工艺的改进,有更好的焊接粘附度,下面链接有对这种现象的解释:
[FAQ] Why do the leadframes look strongly oxidized or corroded?