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74HC4020 SN74HC4020N TC74HC4020AP HD74HC4020P DIP-16 原装
74HC4020N 74HC4020AP TC74HC4020P MC74HC4020N 进口16直插脚
原装SN74AS374N-J TC74HC4020P 74AC08P MB74LS14
原MC14051BCP PC827 MC74HC154N TC74HC4020P
原装MC14051BCP PC827 MC74HC154N TC74HC4020P