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原装SN74LS139N SN74LS138N SN74LS298N UC3854BN TCM29C13AN原装
新74LVC02APWR 74LVC00ADBR 74LS393FPEL SN74AS298AN R
复用器 SN74LS298N SN74LS42N SN74LV4052AN
SN74LS298N TRS232EIN SN74LS75N SN74S138AN SN75ALS194N
原装MC74HC273AN SN74LS298AN HD74HC139P NJM2073D