DM74ALS257MIC DATA SELECTOR/MUX 2-1 16SOIC|FAIRCHILD SEMICONDUCTOR|Lead free|RoHS Compliant SN74ALS257AD DM74ALS257MXIC DATA SELECTOR/MUX QUAD 16SOIC|FAIRCHILD SEMICONDUCTOR|Lead free|RoHS Compliant SN74ALS257ADR SN74ALS257ADR