SN74LS221N LTC6993CDCB-3#TRPBF SN74LS221D LTC6993CDCB-4#TRPBF LTC6993CDCB-2#TRMPBF LTC6993CS6-3#TRPBF LTC6993HS6-4#TRMPBF LTC6993CS6-4#TRPBF LTC6993HS6-2#WTRMPBF LTC6993CS6-1#TRMPBF LTC6993HS6-3#WTRMPBF SN74LS423NG4 LTC6993HS6-1#WTRMPBF LTC6993IDCB-1#TRPBF LTC6993MPS6-3#TRMPBF LTC6993IDCB-2#TRPBF 74VHC221AFT LTC6993IDCB-3#TRPBF 74HC123BQ,115 LTC6993IDCB-4#TRPBF