议价原MC74HC273AN SN74LS298AN HD74HC139P NJM2073D

SN74LS298N SN74LS353N SN74LS365AN SN74LS366AN SN74LS368AN

SN74LS298N TRS232EIN SN74LS75N SN74S138AN SN75ALS194N

SN74LS139N SN74LS138N SN74LS298N UC3854BN TCM29C13AN

复用器 SN74LS298N SN74LS42N SN74LV4052AN