4位2选1FET多路复用器/多路信号分离器2.5V/3.3V低電壓总线開關,具有可耐受5V電壓的电平移位器 SN74CB3T3257PWR TSSOP-16 型號SN74CB3T3257PWR 封裝TSSOP-16 發送詢盤