Exhibit 32.1


      CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
     PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906
                       OF THE SARBANES-OXLEY ACT OF 2002

         I, Lothar  Maier,  certify,  pursuant  to 18 U.S.C.  Section  1350,  as
         adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that
         the Quarterly Report of Linear Technology  Corporation on Form 10-Q for
         the  third  quarter  ended  April  3,  2005  fully  complies  with  the
         requirements  of Section 13(a) or 15(d) of the Securities  Exchange Act
         of 1934 and that information contained in such Quarterly Report on Form
         10-Q fairly presents in all material  respects the financial  condition
         and results of operations of Linear Technology Corporation.


                                            By:      /s/ Lothar Maier
                                            ------------------------------------
                                            Name:  Lothar Maier
                                            Title:    Chief Executive Officer


         I, Paul  Coghlan,  certify,  pursuant  to 18 U.S.C.  Section  1350,  as
         adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that
         the Quarterly Report of Linear Technology  Corporation on Form 10-Q for
         the  third  quarter  ended  April  3,  2005  fully  complies  with  the
         requirements  of Section 13(a) or 15(d) of the Securities  Exchange Act
         of 1934 and that information contained in such Quarterly Report on Form
         10-Q fairly presents in all material  respects the financial  condition
         and results of operations of Linear Technology Corporation.


                                            By:    /s/ Paul Coghlan
                                            ------------------------------------
                                            Name:  Paul Coghlan
                                            Title:   Chief Financial Officer





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