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全新SN74HC244DWRE4 SN74HC244DBRG4 SN74HC240DWRG4 SN74HC240DB
SN74HC244PWRE4/SN74HCT245DBRG4/SN74HC365PWTE4
SN74HC244PWRE4/SN74HC365PWTE4/SN74HCT245DBRG4