DM74ALS646WMIC TRANSCVR TRI-ST 8BIT 24SOIC|FAIRCHILD SEMICONDUCTOR|Lead All|RoHS Mixed SN74ALS646ADW DM74ALS646WMXIC TRANSCVR TRI-ST 8BIT 24SOIC|FAIRCHILD SEMICONDUCTOR|Lead free|RoHS Compliant SN74ALS646ADWRE4