UNITRODE CORP
SC 13G, 1999-10-25
SEMICONDUCTORS & RELATED DEVICES
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                  SCHEDULE 13G

                  Under the Securities Exchange Act of 1934
                                (Amendment No. 2)


                                 Unitrode Corp.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)


                                   913283107
                                 (CUSIP Number)




*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 (the "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).

                  (Continued on following pages)

                                Page 1 of 7 Pages


<PAGE>


- -------------------------------- ------------ -------------------------------

CUSIP NO. 913283107                   13G     Page 2 of 7 Pages

- -------------------------------- ------------ -------------------------------
- ------- ------- --- ------------ ------------ ---- ----------- ---- --- -----


- ------- ------- --- ------------ ------------ ---- ----------- ---- --- -----
- ------- ---------------------------------------------------------------------

  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        OppenheimerFunds, Inc.
        I.R.S. NO. 13-2527171
- ------- ---------------------------------------------------------------------
- ------- ------------------------------------------------------ ---- --- -----

2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
- ------- ------------------------------------------------------ ---- --- -----
- -------                                                        ---- --- -----

                                                                               A
- ------- ------------------------------------------------------ ---- --- -----
- -------                                                        ---- --- -----


- ------- ------------------------------------------------------ ---- --- -----
- -------                                                        ---- --- -----

                                                                          B    X
- ------- ------------------------------------------------------ ---- --- -----
- -------                                                        ---- --- -----


- ------- ------------------------------------------------------ ---- --- -----
- ------- ---------------------------------------------------------------------

3       SEC USE ONLY


- ------- ---------------------------------------------------------------------
- ------- ---------------------------------------------------------------------

4       CITIZENSHIP OR PLACE OF ORGANIZATION

        Colorado

- ------- ---------------------------------------------------------------------
- --------------- --- ---------------------------------------------------------

NUMBER OF SHARES5   SOLE VOTING POWER
BENEFICIALLY OWNED  0
BY EACH
REPORTING
PERSON
WITH
- --------------- --- ---------------------------------------------------------
                --- ---------------------------------------------------------

                6   SHARED VOTING POWER
                    0
- --------------- --- ---------------------------------------------------------
                --- ---------------------------------------------------------

                7   SOLE DISPOSITIVE POWER
                    0
- --------------- --- ---------------------------------------------------------
                --- ---------------------------------------------------------

                8   SHARED DISPOSITIVE POWER
                    850,000
- --------------- --- ---------------------------------------------------------
- ------- ---------------------------------------------------------------------

9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        850,000
- ------- ---------------------------------------------------------------------
- ------- ---------------------------------------------------------------------

10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES*

- ------- ---------------------------------------------------------------------
- ------- ---------------------------------------------------------------------

11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
        2.61%
- ------- ---------------------------------------------------------------------
- ------- ---------------------------------------------------------------------

12      TYPE OF REPORTING PERSON*
        IA
- ------- ---------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>


- -------------------------------- ------------ -------------------------------

CUSIP NO. 913283107                   13G     Page 3 of 7 Pages

- -------------------------------- ------------ -------------------------------
- ------- ------- --- ------------ ------------ ---- ----------- ---- --- -----


- ------- ------- --- ------------ ------------ ---- ----------- ---- --- -----
- ------- ---------------------------------------------------------------------

  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Oppenheimer Quest Opportunity Value Fund
        I.R.S. NO. 13-691880
- ------- ---------------------------------------------------------------------
- ------- ------------------------------------------------------ ---- --- -----

2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
- ------- ------------------------------------------------------ ---- --- -----
- -------                                                        ---- --- -----

                                                                               A
- ------- ------------------------------------------------------ ---- --- -----
- -------                                                        ---- --- -----


- ------- ------------------------------------------------------ ---- --- -----
- -------                                                        ---- --- -----

                                                                          B    X
- ------- ------------------------------------------------------ ---- --- -----
- -------                                                        ---- --- -----


- ------- ------------------------------------------------------ ---- --- -----
- ------- ---------------------------------------------------------------------

3       SEC USE ONLY


- ------- ---------------------------------------------------------------------
- ------- ---------------------------------------------------------------------

4       CITIZENSHIP OR PLACE OF ORGANIZATION

        Massachusetts

- ------- ---------------------------------------------------------------------
- --------------- --- ---------------------------------------------------------

NUMBER OF SHARES5   SOLE VOTING POWER
BENEFICIALLY OWNED  850,000
BY EACH
REPORTING
PERSON
WITH
- --------------- --- ---------------------------------------------------------
                --- ---------------------------------------------------------

                6   SHARED VOTING POWER
                    0
- --------------- --- ---------------------------------------------------------
                --- ---------------------------------------------------------

                7   SOLE DISPOSITIVE POWER
                    0
- --------------- --- ---------------------------------------------------------
                --- ---------------------------------------------------------

                8   SHARED DISPOSITIVE POWER
                    850,000
- --------------- --- ---------------------------------------------------------
- ------- ---------------------------------------------------------------------

9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        850,000
- ------- ---------------------------------------------------------------------
- ------- ---------------------------------------------------------------------

10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES*

- ------- ---------------------------------------------------------------------
- ------- ---------------------------------------------------------------------

11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
        2.61%
- ------- ---------------------------------------------------------------------
- ------- ---------------------------------------------------------------------

12      TYPE OF REPORTING PERSON*
        IV
- ------- ---------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>




                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  Schedule 13G
                    Under the Securities Exchange Act of 1934


Item 1(a)         Name of Issuer:
                  Unitrode Corp.

Item 1(b)         Address of Issuer's Principal Executive Offices:
                  7 Continental Blvd.
                  Merrimack, NH  03054

Item 2(a)         Name of Person Filing:
                  OppenheimerFunds, Inc.

Item 2(b)         Address of Principal Business Office:
                  Two World Trade Center, Suite 3400
                  New York, New York 10048-0203

Item 2(c)         Citizenship:
                  Inapplicable

Item 2(d)         Title of Class of Securities:
                  Common Stock

Item 2(e)         CUSIP Number:
                  913283107

Item 3(e)            X  Investment  Adviser  registered  under  Section 203 of
                    ---
                       the Investment Advisers Act of 1940

Item 4(a)           Amount Beneficially Owned:   850,000 shares

Item 4(b)           Percent of Class:    2.61%

Item 4(c)(i)        Sole Power to vote or to direct the vote -  0

Item 4(c)(ii)       Shared power to vote or to direct the vote - 0

Item 4(c)(iii)      Sole power to dispose or to direct the disposition of - 0

Item 4(c)(iv)       Shared  power to dispose or to direct the  disposition  of
                    -   850,000 shares




<PAGE>



Item 5              Ownership to 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  5% of the  class  of
                    securities, check the following: _X__

Item 6              Ownership  of More than Five  Percent on Behalf of Another
                    ----------------------------------------------------------
                    Person:
                    Inapplicable

Item 7              Identification and Classification of the Subsidiary Which
                    Acquired  the  Security  Being  Reported on By the Parent
                    Holding Company:
                    Inapplicable

Item 8              Identification and Classification of Members of the Group:
                    ---------------------------------------------------------
                    Inapplicable

Item 9              Notice of Dissolution of Group:
                    ------------------------------
                    Inapplicable

Item 10             Certification:
                    By  signing  below,  I  certify  that,  to  the  best  of my
                    knowledge and belief, the securities  referred to above were
                    acquired in the  ordinary  course of  business  and were not
                    acquired  for the  purpose  of and do not have the effect of
                    changing  or  influencing  the control of the issuer of such
                    securities and were not acquired in connection  with or as a
                    participant  in  any  transaction  having  such  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:               October 25, 1999

Signature:          /s/Merryl Hoffman

Name/Title:         Merryl Hoffman, Vice President
















                                    EXHIBIT B

          The undersigned investment company hereby acknowledges and agrees that
a report on Schedule 13G being filed by  OppenheimerFunds,  Inc. on or about the
date hereof,  relating to the Common Stock of Unitrode Corp., is filed on behalf
of the undersigned.


Dated:  October 25, 1999





                                    Oppenheimer Quest Opportunity Value Fund



                                    By:  /s/Robert G. Zack

                                            Robert G. Zack
                                            Assistant Secretary








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