UNITRODE CORP
SC 13G/A, 1999-02-26
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.1)



                                 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.913283197                  13G            Page 2 of 7 Pages
- --------------------------------------------------------------------------------

1    NAME OF REPORTING PERSON
     S.S. OR IRS 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        5   SOLE VOTING POWER: 0
SHARES           ---------------------------------------------------------------
BENEFICIALLY     6   SHARED VOTING POWER: 0
OWNED BY         ---------------------------------------------------------------
EACH             7   SOLE DISPOSITIVE POWER:0 
REPORTING        ---------------------------------------------------------------
PERSONAL         8   SHARED DISPOSITIVE POWER: 3,438,200
WITH             ---------------------------------------------------------------
- --------------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
     3,438,200
- --------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
     
- --------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     10.85%
- -------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*
     IA
- --------------------------------------------------------------------------------


                      *SEE INSTRUCTION BEFORE FILLING OUT!








                              Page 2 of 7 Pages

<PAGE>

CUSIP No.913283197                  13G            Page 3 of 7 Pages
- --------------------------------------------------------------------------------

1    NAME OF REPORTING PERSON
     S.S. OR IRS IDENTIFICATION NO. OF ABOVE PERSON

     Oppenheimer Quest Opportunity Value Fund
     I.R.S. No. 13-6918880
- --------------------------------------------------------------------------------
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        5   SOLE VOTING POWER: 3,110,000
SHARES           ---------------------------------------------------------------
BENEFICIALLY     6   SHARED VOTING POWER: 0
OWNED BY         ---------------------------------------------------------------
EACH             7   SOLE DISPOSITIVE POWER:0 
REPORTING        ---------------------------------------------------------------
PERSONAL         8   SHARED DISPOSITIVE POWER:3,110,000
WITH             ---------------------------------------------------------------
- --------------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
    3,110,000
- --------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
     
- --------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     9.81%
- -------------------------------------------------------------------------------
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: 3,438,200 shares

Item 4(b)       Percent of Class:  10.85%

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 - 
                3,438,200 shares




*includes  the  number of common  shares of Issuer  that will be  received  upon
conversion of the convertible bond by Oppenheimer Quest Opportunity Value Fund.







                              Page 4 of 7 Pages

<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: 
                ------------------------------------------------------------
                

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:  February 11, 1999         




                    /s/ Merryl Hoffman
Signature:     ______________________________________

Name/Title:    Merryl Hoffman, Vice President







                              Page 5 of 7 Pages

<PAGE>
                                  EXHIBIT A
                                  ---------


     The Board of Directors or Trustees of the registered  investment  companies
managed by  OppenheimerFunds,  Inc.  ("OFI") and owning shares of the issuer can
direct the  disposition  of dividends  received by such funds and can dispose of
such  securities.  Additionally,  OFI  shares  the  power  to  dispose  of  such
securities with the Board of Directors or Trustees of such funds;  however,  the
Board of Directors or Trustees of such fund has delegated these responsibilities
to OFI as the fund's investment advisor under its investment advisory agreement.
OFI has an interest  relating to five (5%) percent or more of such securities as
disclosed  on Page 2 hereof,  by virtue of the  interest of five percent (5%) or
more  of such  securities  by  Oppenheimer  Quest Opportunity  Value  Fund,  as
disclosed on pages 3 and 4 hereof.  OFI disclaims  ownership of such securities,
except as expressly stated herein.






































                              Page 6 of 7 Pages
<PAGE>
                                   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: February 11, 1999

                        Oppenheimer Quest Opportunity Value Fund



                             /s/ Robert G. Zack
                        By:______________________________________

                             Robert G. Zack
                             Assistant Secretary





























                              Page 7 of 7 Pages



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