UNITED STATES
                  SECURITIES AND EXCHANGE COMMISSION
                        Washington, D.C. 20549


                             SCHEDULE 13G

               Under the Securities Exchange Act of 1934


                          (Amendment No. 6)*


                            Altera Corporation
                             (Name of Issuer)

                               Common Stock
                      (Title of Class of Securities)

                                021441100
                              (CUSIP Number)

                            December 31, 2007
         (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
[X] Rule 13d-1(b)
[ ] 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: 021441100                                                Page 1 of 5



 1   NAMES OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
     Capital Group International, Inc.


 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

                  22,745,390


             6   SHARED VOTING POWER
 NUMBER OF
   SHARES         NONE
BENEFICIALL
 Y OWNED BY
             7   SOLE DISPOSITIVE POWER
    EACH
 REPORTING        26,768,900
   PERSON
   WITH:
             8   SHARED DISPOSITIVE POWER

                  NONE

 9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     26,768,900     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

     8.0%

 12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

     HC








CUSIP: 021441100                                                Page 2 of 5


                  SECURITIES AND EXCHANGE COMMISSION
                         Washington, DC 20549

                             Schedule 13G
               Under the Securities Exchange Act of 1934

Amendment No. 6

Item 1(a)     Name of Issuer:
       Altera Corporation

Item 1(b)     Address of Issuer's Principal Executive Offices:
       101 Innovation Drive
       San Jose, CA  95134-2020

Item 2(a)     Name of Person(s) Filing:
       Capital Group International, Inc.

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:
       Common Stock

Item 2(e)     CUSIP Number:
       021441100

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:
       (g)     [X]     A parent holding company or control person in
            accordance with section 240.13d-1(b)(1)(ii)(G).

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 page 2

       (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: 021441100                                                Page 3 of 5
 

       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" 26,768,900 shares
       or 8.0% of the 335,867,025 shares of  Common Stock believed to
       be outstanding.

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: One or more clients of Capital Group International,
       Inc. have the right to receive or the power to direct the
       receipt of dividends from, or the proceeds from the sale of,
       the Common Stock of Altera Corporation.


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 is a bank as defined in
          Section 3(a)(6) of the Act and an investment adviser
          registered under Section 203 of the Investment Adviser Act of
          1940, and a wholly owned subsidiary of Capital Group
          International, Inc.

       2. Capital International Limited (CIL) does not fall within any
          of the categories described in Rule 13d-1(b)(ii)(A-F) but its
          holdings of any reported securities come within the five
          percent limitation as set forth in a December 15, 1986 no-
          action letter from the Staff of the Securities and Exchange
          Commission to The Capital Group Companies, Inc. CIL is a
          wholly owned subsidiary of Capital Group International, Inc.

       3. Capital International Research and Management, Inc. dba
          Capital International, Inc. is an investment adviser
          registered under Section 203 of the Investment Advisers Act
          of 1940 and is a wholly owned subsidiary of Capital Group
          International, Inc.

       4. Capital International S.A. (CISA) does not fall within any of
          the categories described in Rule 13d-1(b)(ii)(A-F) but its
          holdings of any reported securities come within the five
          percent limitation as set forth in a December 15, 1986 no-
          action letter from the Staff of the Securities and Exchange
          Commission to The Capital Group Companies, Inc. CISA is a
          wholly owned subsidiary of Capital Group International, Inc.
CUSIP: 021441100                                                Page 4 of 5


Item 8     Identification and Classification of Members of the Group:
       N/A

Item 9     Notice of Dissolution of Group:  N/A

Item 10     Certification

       By signing below, I certify that, to the best of my knowledge
       and belief, the securities referred to above were acquired and
       are held in the ordinary course of business and 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 8, 2008

        Signature:     *David I. Fisher
        Name/Title:    David I. Fisher, Chairman
                       Capital Group International, Inc.



        ^By    /s/ Liliane Corzo
               Liliane Corzo
               Attorney-in-fact

          Signed pursuant to a Power of Attorney dated December 28,
          2007 included as an Exhibit to Schedule 13G filed with the
          Securities and Exchange Commission by Capital Group
          International, Inc. on February 1, 2008 with respect to
          Beazer Homes USA Inc.


















CUSIP: 021441100                                                Page 5 of 5