MC74VHC1G00 MC74VHC1G00DBVT1G MC74VHC1G00DBVT1G-Q MC74VHC1G00DF MC74VHC1G00DF1G MC74VHC1G00DFT MC74VHC1G00DFT1 MC74VHC1G00DFT1G MC74VHC1G00DFT1G 其他IC MC74VHC1G00DFT1G 其他电子管