LTC1421ISW LTC1421ISW#PBF LTC1421ISW#TR LTC1421ISW#TRPBF LTC1421ISW-2.5 LTC1421ISW-2.5#PBF LTC1421ISW-2.5#TR LTC1421ISW-2.5#TRPBF LTC1421ISW-2.5PBF LTC1422