DM74LS240NIC INVERTER DUAL 4-INPUT 20DIP|FAIRCHILD SEMICONDUCTOR|Lead All|RoHS Mixed SN74LS240N DM74LS240WMIC INVERTER DUAL 4-INPUT 20SOIC|FAIRCHILD SEMICONDUCTOR|Lead free|RoHS Compliant SN74LS240DW SN74LS240DWRG4