LS395 LS3954 TO-71 6L 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