LS843 PDIP 8L LS843 SOIC 8L LS843 SOT-23 3L LS843 TO-71 6L LS843 TO-78 6L LS844 LS844 SOIC 8L LS844 SOIC 8L ROHS LS844 SOT-23 3L LS844 SOT-23 6L ROHS