DM74AS646WMIC TRANSCVR TRI-ST 8BIT 24SOIC|FAIRCHILD SEMICONDUCTOR|Lead free|RoHS Compliant SN74AS646DW DM74AS646WMXIC TRANSCVR TRI-ST 8BIT 24SOIC|FAIRCHILD SEMICONDUCTOR|Lead free|RoHS Compliant SN74AS646DWR