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M74HC240B-专业一站式BOM配单原装元器件
丝印M74HC240B M74HC238M M74HC21M1 M74HC21B1 M74HC20F1
MM74HC240MTCX MM74HC138M SS14FP MM3Z4V7B KA78L18AZTA
新MN864716B-EB SN74AS153NSR MM74HC240SJX R