American Technical Ceramics 10-Q 2004 Q4 Quarterly report

                                                            Exhibit 32.1

                                  CERTIFICATION
 PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (SUBSECTIONS (a) AND
        (b) OF SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE)

Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and
(b) of section 1350, chapter 63 of title 18, United States Code), the
undersigned officer of AMERICAN TECHNICAL CERAMICS CORP., a Delaware corporation
(the "Company"), does hereby certify, to such officer's knowledge, that:

The Quarterly Report on Form 10-Q for the quarter ended December 31, 2004 (the
"Form 10-Q") of the Company fully complies with the requirements of Section
13(a) or 15(d) of the Securities Exchange Act of 1934, and the information
contained in the Form 10-Q fairly presents, in all material respects, the
financial condition and results of operations of the Company.

                  Dated:   February 14, 2005         /S/ VICTOR INSETTA
                         ---------------------    --------------------------

                                                   Chief Executive Officer

A signed original of this written statement required by Section 906 has been
provided to the Company and will be retained by the Company and furnished to the
Securities and Exchange Commission or its staff upon request.