EXHIBIT 32.1





CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED
PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002



In connection
with the Form 10-Q of Microtune, Inc. (the Company) for the quarter ended March 31, 2003 as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Harvey B. Cash Chief Executive Officer of the
Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:



|(1) |  | The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
|--- |  | ---------------------------------------------------------------------------------------------------------------------



|(2) |  | The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
|--- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------



|                                              
|----------------------------------------------
|/s/    HARVEY B. (BERRY) CASH                 
|                                              
|Harvey B. (Berry) Cash Office of the President



Date:
July 31, 2003



---

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF THE
SARBANES-OXLEY ACT OF 2002



In connection with the Form 10-Q of Microtune,
Inc. (the Company) for the quarter ended March 31, 2003 as filed with the Securities and Exchange Commission on the date hereof (the Report), I, James H. Clardy, Office of the President, certify, pursuant to 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:



|(1) |  | The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
|--- |  | ---------------------------------------------------------------------------------------------------------------------



|(2) |  | The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
|--- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------



|                                       
|---------------------------------------
|/s/    JAMES H. CLARDY                 
|                                       
|James H. Clardy Office of the President



Date:
July 31, 2003



---

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF THE
SARBANES-OXLEY ACT OF 2002



In connection with the Form 10-Q of Microtune,
Inc. (the Company) for the quarter ended March 31, 2003 as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Albert H. Taddiken, Office of the President, certify, pursuant to 18 U.S.C.
Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:



|(1) |  | The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
|--- |  | ---------------------------------------------------------------------------------------------------------------------



|(2) |  | The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
|--- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------



|                                          
|------------------------------------------
|/s/    ALBERT H. TADDIKEN                 
|                                          
|Albert H. Taddiken Office of the President



Date:
July 31, 2003