LS3954A LS3954A TO-71 6L LS3954A TO-71 6L ROHS LS3955 TO-71 6L LS3955 TO-71 6L ROHS LS3956 TO-71 6L LS3956 TO-71 6L ROHS LS3958 SOIC 8L LS395A LS397M450P50RR0VH2SP0