FST3257MXMUX/DEMUX QUAD 2:1 TTL 16SOIC|FAIRCHILD SEMICONDUCTOR|Lead free|RoHS Compliant SN74CBT3257CDR SN74CBT3257DRG4 FST3257MXMUX/DEMUX QUAD 2:1 TTL 16SOIC|FAIRCHILD SEMICONDUCTOR|Lead free|RoHS Compliant SN74CBT3257CDR SN74CBT3257DRG4