EXHIBIT 23.1


            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statements
(Form S-8 No. 333-109291 and No. 333-111856) pertaining to the AMIS Holdings,
Inc.'s Amended and Restated 2000 Equity Incentive Plan and Restated Employee
Stock Purchase Plan, respectively, of our reports dated February 24, 2005, with
respect to the consolidated financial statements of AMIS Holdings, Inc., AMIS
Holdings, Inc. management's assessment of the effectiveness of internal control
over financial reporting, and the effectiveness of internal control over
financial reporting of AMIS Holdings, Inc., included in the Annual Report (Form
10-K) for the year ended December 31, 2004.

                                            /s/ Ernst & Young LLP



Salt Lake City, Utah
March 8, 2005