74AC646SCIC TXRX/REGISTER 3ST 8BIT 24SOIC|FAIRCHILD SEMICONDUCTOR|Lead free|RoHS Compliant MC74AC646DWG 74AC646SCXIC TXRX/REGISTER 3ST 8BIT 24SOIC|FAIRCHILD SEMICONDUCTOR|Lead free|RoHS Compliant MC74AC646DWR2G MC74AC646DWG