Synaptics (SYNA) 10-Q 2004 Q2 Quarterly report

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 Quarterly Report on Form 10-Q of Synaptics Incorporated (the “Company”) for the quarterly period ended December 27, 2003 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Francis F. Lee, President, Chief Executive Officer, and Director of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 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 (15 U.S.C. 78m(a) or 78o(d)); 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/ Francis F. LeeFrancis F. Lee

President, Chief Executive Officer, and Director

February 5, 2004