UNITED STATES 
                  SECURITIES AND EXCHANGE COMMISSION 
                        Washington, D.C. 20549 
                                    
                                    
                             SCHEDULE 13G 
                                    
               Under the Securities Exchange Act of 1934 
                                    
                                    
                          (Amendment No. 4)* 
                                    
                                    
                         Infineon Technologies AG 
                             (Name of Issuer) 
                                      
         American Depositary Shares representing Ordinary Shares 
                      (Title of Class of Securities) 
                                      
                                45662N103 
                              (CUSIP Number) 
                                    
                            December 31, 2004 
         (Date of Event Which Requires Filing of this Statement) 
                                    
                                    
Check the appropriate box to designate the rule pursuant to which this 
Schedule is filed: 
[ ] Rule 13d-1(b) 
[X] Rule 13d-1(c) 
[ ] Rule 13d-1(d) 
 
 
*The remainder of this cover page shall be filled out for a reporting 
person's initial filing on this form with respect to the subject class 
of securities, and for any subsequent amendment containing information 
which would alter the disclosures provided in a prior cover page. 
 
The information required in the remainder of this cover page shall not 
be deemed to be "filed" for the purpose of Section 18 of the Securities 
Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of 
that section of the Act but shall be subject to all other provisions of 
the Act (however, see the Notes). 
                                    


















CUSIP: 45662N103                                                Page 1 of 7 

                                    
 1   NAMES OF REPORTING PERSONS 
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) 
     Capital Group International, Inc. 
     95-4154357 
      
 2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE          
     INSTRUCTIONS)                                                 (a)     
                                                                      
                                                                    (b)     
 3   SEC USE ONLY 
      
      
 4   CITIZENSHIP OR PLACE OF ORGANIZATION 
      
     California 

             5   SOLE VOTING POWER 
                   
                  53,991,870 

       
             6   SHARED VOTING POWER 
 NUMBER OF         
   SHARES         NONE 
BENEFICIALL        
 Y OWNED BY 
             7   SOLE DISPOSITIVE POWER 
    EACH           
 REPORTING        69,761,740 
   PERSON 
   WITH: 
             8   SHARED DISPOSITIVE POWER 
                   
                  NONE 
                   
 9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
      
     69,761,740     Beneficial ownership disclaimed pursuant to Rule 13d-4 



 10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 
     (SEE INSTRUCTIONS) 
      
      
 11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 
      
     9.4% 

 12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) 
      
     HC   







CUSIP: 45662N103                                                Page 2 of 7 
 
 
 

                                    
 1   NAMES OF REPORTING PERSONS 
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) 
     Capital International Limited 
      
 2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE          
     INSTRUCTIONS)                                                 (a)     
                                                                      
                                                                    (b)     
 3   SEC USE ONLY 
      
      
 4   CITIZENSHIP OR PLACE OF ORGANIZATION 
      
     United Kingdom 

             5   SOLE VOTING POWER 
                   
                  32,003,130 

       
             6   SHARED VOTING POWER 
 NUMBER OF         
   SHARES         NONE 
BENEFICIALL        
 Y OWNED BY 
             7   SOLE DISPOSITIVE POWER 
    EACH           
 REPORTING        40,817,020 
   PERSON 
   WITH: 
             8   SHARED DISPOSITIVE POWER 
                   
                  NONE 
                   
 9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
      
     40,817,020     Beneficial ownership disclaimed pursuant to Rule 13d-4 



 10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 
     (SEE INSTRUCTIONS) 
      
      
 11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 
      
     5.5% 

 12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) 
      
     CO   

 




CUSIP: 45662N103                                                Page 3 of 7 
 
 
 

                  SECURITIES AND EXCHANGE COMMISSION 
                         Washington, DC 20549 
                                    
                             Schedule 13G 
               Under the Securities Exchange Act of 1934 
                                    
                                    
Amendment No. 4 
 
Item 1(a)     Name of Issuer: 
       Infineon Technologies AG 
 
Item 1(b)     Address of Issuer's Principal Executive Offices: 
       St.-Martin-Strasse 53 
       D-81541 Munich, Germany 
       Attn: Finance and Treasury-Capital Market 
        
Item 2(a)     Name of Person(s) Filing: 
       Capital Group International, Inc. and Capital International 
       Limited 
        
Item 2(b)     Address of Principal Business Office or, if none, 
       Residence: 
       11100 Santa Monica Blvd. 
       Los Angeles, CA  90025 
        
Item 2(c)     Citizenship:   N/A 
        
Item 2(d)     Title of Class of Securities: 
       American Depositary Shares representing Ordinary Shares 
        
Item 2(e)     CUSIP Number: 
       45662N103 
        
Item 3     If this statement is filed pursuant to sections 240.13d-1(b) 
       or 240.13d-2(b) or (c), check whether the person filing is a: 
       N/A 
        
Item 4     Ownership 
        
       Provide the following information regarding the aggregate 
       number and percentage of the class of securities of the issuer 
       identified in Item 1. 
        
       See pages 2 and 3 
        
       (a)    Amount beneficially owned: 
       (b)    Percent of class: 
       (c)    Number of shares as to which the person has: 
       (i)    Sole power to vote or to direct the vote: 
       (ii)   Shared power to vote or to direct the vote: 
       (iii)  Sole power to dispose or to direct the disposition of: 
       (iv)   Shared power to dispose or to direct the disposition of: 
        




CUSIP: 45662N103                                                Page 4 of 7 
 
 
 

                                    
       Capital Group International, Inc. ("CGII") is the parent 
       holding company of a group of investment management companies 
       that hold investment power and, in some cases, voting power 
       over the securities reported in this Schedule 13G.  The 
       investment management companies, which include a "bank" as 
       defined in Section 3(a)(6) of the Securities Exchange Act of 
       1934 (the "Act") and several investment advisers registered 
       under Section 203 of the Investment Advisers Act of 1940, 
       provide investment advisory and management services for their 
       respective clients which include registered investment 
       companies and institutional accounts.  CGII does not have 
       investment power or voting power over any of the securities 
       reported herein.  However, by virtue of Rule 13d-3 under the 
       Act, CGII may be deemed to "beneficially own" 69,761,740 shares 
       or 9.4% of the 740,359,680 shares of  Ordinary Shares, 
       including American Depositary Shares, believed to be 
       outstanding.  
        
       Capital International Limited is deemed to be the beneficial 
       owner of 40,817,020 shares or 5.5% of the 740,359,680 shares of 
       Ordinary Shares, including American Depositary Shares, believed 
       to be outstanding as a result of its serving as the investment 
       manager of various institutional accounts. 
        
       Shares reported by Capital Group International, Inc., include 
       280,930 American Depositary shares representing 280,930 shares 
       of the Ordinary Shares.  
        
        
Item 5     Ownership of Five Percent or Less of a Class.  If this 
       statement is being filed to report the fact that as of the date 
       hereof the reporting person has ceased to be the beneficial 
       owner of more than five percent of the class of securities, 
       check the following: [ ] 
        
Item 6     Ownership of More than Five Percent on Behalf of Another 
       Person: N/A 
        
Item 7     Identification and Classification of the Subsidiary Which 
       Acquired the Security Being Reported on By the Parent Holding 
       Company or Control Person. 
        
       1. Capital Guardian Trust Company (CGTC) 
           
       2. Capital International Limited (CIL) 
           
       3. Capital International S.A. (CISA) 
           
       4. Capital International Research and Management, Inc. dba 
          Capital International, Inc. (CII) 
        
Item 8     Identification and Classification of Members of the Group:  
       N/A 
        
Item 9     Notice of Dissolution of Group:  N/A 
        
Item 10     Certification 
        

CUSIP: 45662N103                                                Page 5 of 7 
 

                                    
       By signing below I certify that, to the best of my knowledge 
       and belief, the securities referred to above were not acquired 
       and are not held for the purpose of or with the effect of 
       changing or influencing the control of the issuer of the 
       securities and were not acquired and are not held in connection 
       with or as a participant in any transaction having that purpose 
       or effect. 
        
     Signature 
        
       After reasonable inquiry and to the best of my knowledge and 
       belief, I certify that the information set forth in this 
       statement is true, complete and correct. 
 
 
        Date:          February 11, 2005 
                        
        Signature:     *David I. Fisher 
        Name/Title:    David I. Fisher, Chairman 
                       Capital Group International, Inc. 
 
        Date:          February 11, 2005 
                        
        Signature:     *David I. Fisher 
        Name/Title:    David I. Fisher, Vice Chairman 
                       Capital International Limited 
 
        
        
        *By    /s/ Kristine Nishiyama 
               Kristine Nishiyama 
               Attorney-in-fact 
        
               Signed pursuant to a Power of Attorney dated January 30, 
               2003 included as an Exhibit to Schedule 13G filed with 
               the Securities and Exchange Commission by Capital Group 
               International, Inc. on February 10, 2003 with respect to 
               Acclaim Entertainment Inc. 


















CUSIP: 45662N103                                                Page 6 of 7 
 

                               AGREEMENT 
                                    
                            Los Angeles, CA 
                           February 11, 2005 
 
  Capital Group International, Inc. ("CGII") and Capital International 
Limited ("CIL") hereby agree to file a joint statement on Schedule 13G 
under the Securities Exchange Act of 1934 (the "Act") in connection 
with their beneficial ownership of American Depositary Shares 
representing Ordinary Shares issued by Infineon Technologies AG. 
   
  CGII and CIL state that they are each entitled to individually use 
Schedule 13G pursuant to Rule 13d-1(c) of the Act. 
   
  CGII and CIL are each responsible for the timely filing of the 
statement and any amendments thereto, and for the completeness and 
accuracy of the information concerning each of them contained therein 
but are not responsible for the completeness or accuracy of the 
information concerning the others. 
   
   
   
                 CAPITAL GROUP INTERNATIONAL, INC. 
                  
                 BY:              *David I. Fisher 
                                  David I. Fisher, Chairman 
                                   Capital Group International, 
                                   Inc. 
 
 
                 CAPITAL INTERNATIONAL LIMITED 
                  
                 BY:              *David I. Fisher 
                                  David I. Fisher, Vice Chairman 
                                   Capital International Limited 
 
 
*By  /s/ Kristine Nishiyama 
     Kristine Nishiyama 
     Attorney-in-fact 
      
     Signed pursuant to a Power of Attorney dated January 30, 2003 
     included as an Exhibit to Schedule 13G filed with the Securities 
     and Exchange Commission by Capital Group International, Inc. on 
     February 10, 2003 with respect to Acclaim Entertainment Inc. 
      















CUSIP: 45662N103                                                Page 7 of 7