LS841 SOIC 8L LS841 TO-71 6L LS841 TO-71 6L ROHS LS841 TO-78 6L LS841 TO-78 6L ROHS LS842 SOIC 8L LS842 TO-71 6L LS843 PDIP 8L LS843 SOIC 8L LS843 SOT-23 3L