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UNITED STATES SECURITIES AND
    EXCHANGE COMMISSIONWashington, D.C.
    20549
    AMENDMENT
    NO. 1
 TO
 FORM 20-F
  o

REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g)  OF
    THE SECURITIES EXCHANGE ACT OF 1934ORþ

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
    SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended September 30, 2007ORo

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
    SECURITIES EXCHANGE ACT OF 1934For the transition period
    from          to          .ORo

SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d)  OF THE
    SECURITIES EXCHANGE ACT OF 1934Date of event requiring this shell company
    report          .   Commission file
    number: 1-15000
 Infineon Technologies
    AG
 (Exact name of Registrant as
    specified in its charter)
  Federal Republic of
    Germany
 (Jurisdiction of incorporation
    or organization)
  Am Campeon 1-12,
 D-85579 Neubiberg
 Federal Republic of
    Germany
 (Address of principal executive
    offices)
  Securities registered or to be
    registered pursuant to Section 12(b) of the Act:
  Title of Each Class

Name of Each Exchange on Which RegisteredAmerican Depositary Shares, each representing

New York Stock Exchangeone ordinary share, notional value 2.00 per shareOrdinary shares, notional value 2.00 per share*

New York Stock Exchange   *
    
    Listed, not for trading or
    quotation purposes, but only in connection with the registration
    of American Depositary Shares pursuant to the requirements of
    the Securities and Exchange Commission    Securities registered or to be
    registered pursuant to Section 12(g) of the Act:
    None
    Securities for which there is a
    reporting obligation pursuant to Section 15(d) of the Act:
    None
      þ o
  o þ
    þ o
  Rule 12b-2
 Large accelerated
    filer þ     Accelerated
    filer oNon-accelerated
    filer o
  o þ
  Rule 12b-2 o þ
  (APPLICABLE ONLY TO ISSUERS
    INVOLVED IN BANKRUPTCY PROCEEDINGS DURING THE PAST FIVE
    YEARS)
  o o




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Explanatory
    Note
  Form 20-F
  Item 19.
    Exhibits




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TABLE OF CONTENTS  SIGNATURESExhibit 12.1Exhibit 12.2Exhibit 13Exhibit 15.1    Table of Contents  
  SIGNATURES
  Form 20-F
     Infineon Technologies AG
  /s/  Wolfgang
    Ziebart      Peter
    J. Fischl




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Exhibit Index
  Exhibit





Exhibit

Filing Date

SEC FileNumber

Description of Exhibit

Form

Number

with SEC

Number1.1

Articles of Association (as of November 2007) (English
    translation)

20-F

1.1

December 7, 2007

1-150001.2

Rules of Procedure for the Management Board (as of November
    2007) (English translation)

20-F

1.2

December 7, 2007

1-150001.3

Rules of Procedure for the Supervisory Board (as of November
    2007) (English translation)

20-F

1.3

December 7, 2007

1-150001.4

Rules of Procedure for the Investment Finance and Audit
    Committee of the Supervisory Board (as of November 2007)
    (English translation)

20-F

1.4

December 7, 2007

1-150002

The total amount of long-term debt securities of Infineon
    Technologies AG authorized under any instrument does not exceed
    10% of the total assets of the group on a consolidated basis.
    Infineon Technologies AG hereby agrees to furnish to the SEC,
    upon its request, a copy of any instrument defining the rights
    of holders of long-term debt of Infineon Technologies AG or of
    its subsidiaries for which consolidated or unconsolidated
    financial statements are required to be filed.4.3

Patent Cross License Agreement between Infineon and Siemens AG,
    dated as of February 11, 2000

F-1

10.7

February 18, 2000

333-115084.9

Shareholder Agreement of ALTIS Semiconductor between Infineon
    Technologies Holding France and Compagnie IBM France, dated as
    of June 24, 1999

F-1

10.15

February 18, 2000

333-115084.18

Joint Venture Agreement between Infineon and Nanya Technology
    Corporation, executed on November 13, 2002

20-F

4.38

December 4, 2002

1-150004.19

Amendments No 1, 2 and 3 to the Joint Venture Agreement between
    Infineon and Nanya Technology Corporation, executed on
    November 13, 2002

20-F

4.19

November 23, 2005

1-150004.19.1

Amendment No. 4 to the Joint Venture Agreement between
    Infineon and Nanya Technology Corporation, executed on
    November 13, 2002

Filed as exhibit 10(i)(I) to the registration statement on form
    F-1 of
    Qimonda AG dated August 8, 2006 (file 333-135913) and
    incorporated herein by reference4.20

Terms and Conditions of 5% Guaranteed Subordinated Convertible
    Notes due 2010 in the aggregate nominal amount of EUR
    700,000,000 (the 2010 Notes) issued on June 5,
    2003 by Infineon Technologies Holding B.V.

20-F

4.30

November 21, 2003

1-150004.21

Undertaking for Granting of Conversion Rights from Infineon to
    JPMorgan Chase Bank for the benefit of the holders of the 2010
    Notes, dated June 2, 2003

20-F

4.31

November 21, 2003

1-150004.22

Subordinated Guarantee of Infineon, as Guarantor, in favor of
    the holders of 2010 Notes, dated June 2, 2002

20-F

4.32

November 21, 2003

1-150004.23

Loan Agreement dated June 2, 2003, between Infineon
    Technologies Holding B.V., as Issuer, and Infineon

20-F

4.33

November 21, 2003

1-150004.24

Assignment Agreement dated June 2, 2003, among Infineon
    Technologies Holding B.V., Infineon and JPMorgan Chase Bank for
    the benefit of the holders of the 2010 Notes

20-F

4.34

November 21, 2003

1-150004.25

Amendment 1, dated June 26, 2003, to Shareholder Agreement
    of ALTIS Semiconductor between Infineon Technologies Holding
    France and Compagnie IBM France, dated as of June 24, 1999

20-F

4.35

November 21, 2003

1-150004.25.1

Amendment 2 effective as of December 31, 2005 to
    Shareholder Agreement of ALTIS Semiconductor between Infineon
    Technologies Holding France and IBM XXI SAS dated as of
    June 24, 1999

20-F

4.25.1

November 30, 2006

1-150004.25.2

Framework Agreement dated as of August 8, 2007 among
    GlobalInformService, International Business Machines Corporation
    and Infineon Technologies AG, related to ALTIS Semiconductor

20-F

4.25.2

December 7, 2007

1-15000




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Exhibit





Exhibit

Filing Date

SEC FileNumber

Description of Exhibit

Form

Number

with SEC

Number4.26

Real Estate Leasing Contract between MoTo Object CAMPEON
    GmbH & Co. KG and Infineon dated as of
    December 23, 2003, with Supplementary Agreements No 1 and 2
    (English translation)

20-F

4.28

November 26, 2004

1-150004.27.1

Contribution Agreement (Einbringungsvertrag)between
    Infineon Technologies AG and Qimonda AG, dated as of
    April 25, 2006, and addendum thereto, dated as of
    June 2, 2006 (English translation)

Filed as exhibit 10(i)(A) to the registration statement on
    form F-1
    of Qimonda AG dated August 8, 2006 (file 333-135913) and
    incorporated herein by reference4.27.2

Contribution Agreement (Einbringungsvertrag)between
    Infineon Holding B.V. and Qimonda AG, dated as of May 4,
    2006 (English translation)

Filed as exhibit 10(i)(B) to the registration statement on
    form F-1
    of Qimonda AG dated August 8, 2006
    (file 333-135913)
    and incorporated herein by reference4.27.3

Addenda No. 2 and 3 to Contribution Agreement
    (Einbringungsvertrag)between Infineon Technologies AG
    and Qimonda AG, dated as of April 25, 2006 (English
    translation)

Filed as exhibit 4(i)(W) to the annual report on
    form 20-F
    of Qimonda AG dated November 21, 2006 (file 1-32972) and
    incorporated herein by reference4.27.5

Master Loan Agreement between Qimonda AG and Infineon
    Technologies Holding B.V., dated April 28, 2006

Filed as exhibit 10(i)(D) to the registration statement on
    form F-1
    of Qimonda AG dated August 8, 2006
    (file 333-135913)
    and incorporated herein by reference4.27.6

Global Services Agreement between Infineon Technologies AG and
    Qimonda AG, effective May 1, 2006

Filed as exhibit 10(i)(E) to the registration statement on form
    F-1 of Qimonda AG dated August 8, 2006 (file 333-135913) and
    incorporated herein by reference4.27.7

Master IT Cost Sharing Agreement by and between Infineon
    Technologies AG and Qimonda AG, effective May 1, 2006

Filed as exhibit 10(i)(Q) to the registration statement on
    form F-1
    of Qimonda AG dated August 8, 2006 (file 333-135913) and
    incorporated herein by reference4.28.1

Terms and Conditions of the 1.375% Guaranteed Subordinated Notes
    due 2010 in the aggregate nominal amount of EUR 215,000,000 (the
    2007/2010 Notes) issued by Infineon Technologies
    Investment B.V., on September 26, 2007

20-F

4.28.1

December 7, 2007

1-150004.28.2

Subordinated Guarantee by Infineon Technologies AG in Favor of
    the Holders of the 2007/2010 Notes

20-F

4.28.2

December 7, 2007

1-150004.29

Asset Purchase Agreement by and between LSI Corporation and
    Infineon Technologies AG dated as of August 20, 2007

Filed as exhibit 2.1 to the current report on form 8-K of LSI
    Corporation dated October 24, 2007 (file 1-10317) and
    incorporated herein by reference. Infineon Technologies AG
    agrees to furnish supplementally a copy of any omitted schedule
    to the Securities and Exchange Commission upon request.8

List of Significant Subsidiaries and Associated Companies of
    Infineon

See Additional Information  Organizational
    Structure12.1

Certification of chief executive officer pursuant to Exchange
    Act
    Rule 13a-14(a)

Filed herewith12.2

Certification of chief financial officer pursuant to Exchange
    Act
    Rule 13a-14(a)

Filed herewith13

Certificate pursuant to 18 U.S.C. section 1350, as
    adopted pursuant to section 906 of the Sarbanes-Oxley Act
    of 2002

Filed herewith15.1

Material incorporated into this Annual Report on
    Form 20-F,
    as amended, by reference to the Annual Report on
    Form 20-F
    of Qimonda AG

Filed herewith     
    
    Confidential treatment requested as
    to certain portions, which portions have been filed separately
    with the Securities and Exchange Commission.