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74HCT244PWRSN 74HCT244PWR TSSOP20 全新原装
原装SN74AHC374PWRSN74AHC540PWR
原装SN74AHC244PWRSN74AHC245PWR
原装SN74HCT541PWRSN74HCT245PWR
SN74HCT273APWRSN74HCT244APWR