SEMTECH CORP
SC 13D/A, 1997-05-29
SEMICONDUCTORS & RELATED DEVICES
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                                                      Page 1 of 12 Pages


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                               (Amendment No. 1 )
                                       ---

                               SEMTECH CORPORATION
         --------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
         --------------------------------------------------------------
                         (Title of Class of Securities)

                                   816850 10 1
         --------------------------------------------------------------
                                 (CUSIP Number)

          Jon D. Walton, Vice President, General Counsel and Secretary,
        Allegheny Teledyne Incorporated, 1000 Six PPG Place, Pittsburgh,
                        Pennsylvania 15222 412-394-2836
         --------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                  May 20, 1997
         --------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following box if a fee is being paid with this statement [ ].

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.


<PAGE>

                  SCHEDULE 13D, Amendment No.1

CUSIP NO. 816850 10 1                        Page 2 of 12 Pages
- ---------------------------------------------------------------

1     NAME OF REPORTING PERSON  Allegheny Teledyne Incorporated
                                -------------------------------

      S.S. or I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON


2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                  (a)  ___
                                                  (b)  ___

3     SEC USE ONLY

4     SOURCE OF FUNDS           N/A
                                ---

5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
PURSUANT TO ITEMS 2(d) OR 2(e)                  [  ]

6     CITIZENSHIP OR PLACE OF ORGANIZATION         Delaware
                                                   --------

 NUMBER OF          7   SOLE VOTING POWER                 0
   SHARES
BENEFICIALLY        8   SHARED VOTING POWER         628,763
  OWNED BY
    EACH            9   SOLE DISPOSITIVE POWER            0
 REPORTING
   PERSON          10   SHARED DISPOSITIVE POWER    628,763
    WITH

11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON
                                                    628,763
                                                    -------

12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
       CERTAIN SHARES                                 [   ]

13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

                                                      10.2%
                                                      ----

14     TYPE OF REPORTING PERSON                      HC,CO
                                                     -----
<PAGE>


                 SCHEDULE 13D, Amendment No. 1

CUSIP NO. 816850 10 1                        Page 3 of 12 Pages
- ---------------------------------------------------------------

1     NAME OF REPORTING PERSON                   Teledyne, Inc.
                                                 --------------

      S.S. or I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON


2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                  (a)  ___
                                                  (b)  ___

3     SEC USE ONLY

4     SOURCE OF FUNDS           N/A
                                ---

5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
PURSUANT TO ITEMS 2(d) OR 2(e)                  [  ]

6     CITIZENSHIP OR PLACE OF ORGANIZATION         Delaware
                                                   --------

 NUMBER OF          7   SOLE VOTING POWER                 0
   SHARES
BENEFICIALLY        8   SHARED VOTING POWER         628,763
  OWNED BY
    EACH            9   SOLE DISPOSITIVE POWER            0
 REPORTING
   PERSON          10   SHARED DISPOSITIVE POWER    628,763
    WITH

11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON
                                                    628,763
                                                    -------

12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
       CERTAIN SHARES                                  [  ]

13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

                                                      10.2%
                                                      ----

14     TYPE OF REPORTING PERSON                      HC,CO


<PAGE>


                SCHEDULE 13D, Amendment No. 1

CUSIP NO. 816850 10 1                        Page 4 of 12 Pages
- ---------------------------------------------------------------
The statement on Schedule 13D dated  December 21, 1979 filed by Teledyne,  Inc.,
is hereby amended in its entirety to read as follows:

Item 1.   Security and Issuer

            This Statement relates to the Common Stock, $0.01 par value ("Common
Stock"),  of Semtech  Corporation,  652 Mitchell Road, Newbury Park,  California
91320 (the "Issuer").

Item 2.  Identity and Background

            The persons filing this Schedule are:

            (1) Teledyne, Inc., 2049 Century Park East, Los Angeles,  California
90067  ("Teledyne").  Teledyne,  a  Delaware  corporation,  is  a  wholly  owned
subsidiary of Allegheny Teledyne Incorporated.  Teledyne is primarily engaged in
the  manufacturing and sale of a wide range of specialty  materials,  industrial
and consumer products.

            For  additional  information  concerning the directors and principal
officers of Teledyne, see Schedule TDY.

            (2) Allegheny Teledyne Incorporated, 1000 Six PPG Place, Pittsburgh,
Pennsylvania  15222  ("Allegheny  Teledyne").  Allegheny  Teledyne,  a  Delaware
corporation,  is  a  technology-based  manufacturing  company  with  significant
concentration  in specialty  metals,  complemented by aerospace and electronics,
industrial and consumer products. Allegheny Teledyne owns all of the outstanding
capital stock of Teledyne.

            For  additional  information  concerning the directors and principal
officers of Allegheny Teledyne, see Schedule ALT.

            During the past five years,  neither Teledyne nor Allegheny Teledyne
has been  convicted in a criminal  proceeding;  nor, to the best  knowledge  and
belief of Teledyne or Allegheny  Teledyne,  have any persons listed in Schedules
TDY and ALT been convicted in such proceedings.

            During the past five years,  neither Teledyne nor Allegheny Teledyne
nor anyone listed in the attached Schedules was a party to a civil proceeding of
a judicial or administrative  body of competent  jurisdiction and as a result of
such proceeding was or is subject to a judgment, decree or final order enjoining
future violations of, or prohibiting or mandating activities subject to, federal
or state securities laws or finding any violation with respect to such laws.

<PAGE>

                    SCHEDULE 13D, Amendment No.1

CUSIP NO. 816850 10 1                        Page 5 of 12 Pages
- ---------------------------------------------------------------

Item 3.  Source and Amount of Funds or Other Consideration.

            In February 1989,  Teledyne  acquired 529,100 shares of Common Stock
in exchange for the 8.50%  Convertible  Subordinated  Debentures Due 1996 of the
Issuer. Immediately prior to this acquisition,  Teledyne owned 421,663 shares of
Common Stock. On December 12, 1979,  Teledyne  Industries,  Inc., a wholly owned
subsidiary of Teledyne  ("Industries")  purchased 191,618 shares of Common Stock
for  $1,173,660.  (Industries  used its general  corporate  funds to effect such
acquisition which included from time to time advances from Teledyne.) Industries
and Teledyne also acquired an  additional  183,026  shares in 1960 for $2,700 (a
Schedule 13G with respect to such shares was  previously  filed pursuant to Rule
13d-1(c)). The remainder of the shares were acquired from the Issuer in the form
of stock dividends. Teledyne Industries dividended the shares of Common Stock it
owned to Teledyne in 1982.

Item 4.  Purpose of Transaction.

            The shares reported herein were acquired for investment.  The filing
persons have no plans or proposals which relate to Item 4(a) through (j). On May
20,  1997,  Teledyne  sold  100,000  shares of Common  Stock and filed  with the
Securities and Exchange Commission a Report on Form 144 indicating its intention
to sell up to a total of 322,000 shares of the Issuer's Common Stock. On May 23,
1997,   Teledyne  sold  222,000  shares  of  Common  Stock.   Future  investment
considerations  by  the  filing  persons  might  result  in the  disposition  of
additional shares of the Common Stock.

Item 5.  Interest in Securities of the Issuer.

            Allegheny  Teledyne  holds  directly  no  shares  of  Common  Stock.
Teledyne owns 628,763 shares of Common Stock.  Allegheny  Teledyne may be deemed
to be the beneficial  owner of shares held by Teledyne since it is the parent of
Teledyne. Allegheny Teledyne and Teledyne may be deemed to share dispositive and
voting power over all such shares.

            To the best knowledge of the filing persons, no associate, executive
officer or director of such filing  person (a) owns any shares of Common  Stock;
(b) has a right to acquire  shares of Common  Stock;  or (c) has  engaged in any
transactions in the Common Stock during the past sixty days.


<PAGE>



                  SCHEDULE 13D, Amendment No.1

CUSIP NO. 816850 10 1                        Page 6 of 12 Pages
- ---------------------------------------------------------------

            See Items 3 and 4 for a description of transactions  effected during
the past  sixty  days or since  Teledyne's  most  recent  Schedule  13D  filing.
Teledyne Industries'  ownership of the Issuer's securities was reduced to 0 as a
result of the 1982 transaction whereby Teledyne Industries dividended the shares
of Common Stock it owned to Teledyne.

Item 6.  Contracts, Arrangements, or Understandings with Respect
         to Securities of the Issuer.

            See Item 5.

Item 7.  Material to Be Filed as Exhibits.

            Attached  as  Exhibit  A is  a  copy  of  an  Agreement  authorizing
Allegheny Teledyne and Teledyne to file a Joint Statement.

<PAGE>


               SCHEDULE 13D, Amendment No.1

CUSIP NO. 816850 10 1                        Page 7 of 12 Pages
- ---------------------------------------------------------------

            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:  May 29, 1997               ALLEGHENY TELEDYNE INCORPORATED



                                  By:  /s/ James L. Murdy
                                     ---------------------------
                                     Executive Vice President,
                                     Finance and Administration
                                     and Chief Financial Officer

DATE:  May 29, 1997               TELEDYNE, INC.



                                  By:  /s/ Douglas J. Grant
                                     ---------------------------
                                     Vice President-Finance

<PAGE>


                    SCHEDULE 13D, Amendment No. 1

CUSIP NO. 816850 10 1                        Page 8 of 12 Pages
- ---------------------------------------------------------------


SCHEDULE TDY

                           Teledyne, Inc.


Name                   Business      Position with TDY and/or
(All US Citizens)      Address       Principal Occupation

Richard P. Simmons       (1)         Director, President and
                                     Chief Executive Officer
Arthur H. Aronson        (1)         Senior Vice President
Hudson B. Drake          (2)         Senior Vice President
Douglas J. Grant         (2)         Vice President-Finance
James L. Murdy           (1)         Director, Executive Vice
                                     President-Finance and
                                     Administration
Robert S. Park           (1)         Vice President-Treasurer
Dale G. Reid             (1)         Vice President-Controller
Gary L. Riley            (1)         Senior Vice President
Jon D. Walton            (1)         Director, Vice
President,                                        General Counsel and
                                     Secretary

(1)  Teledyne, Inc., c/o Allegheny Teledyne Incorporated, 1000 Six PPG Place,
Pittsburgh, PA  15222
(2)  Teledyne, Inc., 2409 Century Park East, Los Angeles, California  90067



<PAGE>



                    SCHEDULE 13D, Amendment No. 1

CUSIP NO. 816850 10 1                        Page 9 of 12 Pages
- ---------------------------------------------------------------


SCHEDULE ALT

                  Allegheny Teledyne Incorporated

                               Position with Allegheny
Name                  Business Teledyne and/or Principal
(All US Citizens)     Address  Occupation

Richard P. Simmons      (1)    Director, Chairman, President
                               and Chief Executive Officer
Arthur H. Aronson       (1)    Director, Executive Vice President
Robert P. Bozzone       (1)    Director, Vice Chairman
Paul S. Brentlinger     (2)    Director (2)
Frank V. Cahouet        (3)    Director (3)
Diane C. Creel          (4)    Director (4)
Hudson B. Drake         (1)    Vice President
C. Fred Fetterolf       (5)    Director (5)
W. Craig McClelland     (6)    Director (6)
Robert Mehrabian        (7)    Director (7)
James L. Murdy          (1)    Executive Vice President, Finance
                               and Administration and Chief
                                Financial Officer
William G. Ouchi        (8)    Director (8)
Robert S. Park          (1)    Vice President-Treasurer
Charles J. Queenan, Jr. (9)    Director (9)
Dale G. Reid            (1)    Vice President-Controller
Gary L. Riley           (1)    Vice President
George A. Roberts      (10)    Director (10)
James E. Rohr          (11)    Director (11)
Fayez Sarofim          (12)    Director (12)
Jon D. Walton           (1)    Vice President, General Counsel
                                  and Secretary

(1)  Allegheny Teledyne Incorporated, 1000 Six PPG Place, Pittsburgh, PA
15222, except in the case of Hudson B. Drake, whose business address is
Allegheny Teledyne Incorporated, 2049 Century Park East, Los Angeles, CA
90067.
(2)  Partner, Morganthaler Ventures.  Business address:  Morganthaler
Ventures, 700 National City Bank Building, Cleveland, Ohio  44114.
(3)  Chairman, President and Chief Executive Officer, Mellon Bank.  Business
address:  Mellon Bank, One Mellon Bank Center, Pittsburgh, PA  15258.
(4)  Chief Executive Officer and President, EarthTech.  Business address:
EarthTech, 100 West Broadway, Long Beach, CA  90802.
(5)  Consultant.  Business address:  210 Overlook Drive, 79 North Industrial
Park, Sewickely, PA  15143.

<PAGE>

                    SCHEDULE 13D, Amendment No. 1

CUSIP NO. 816850 10 1                       Page 10 of 12 Pages
- ---------------------------------------------------------------

SCHEDULE ALT, contined


(6)  Chairman and Chief Executive Officer, Union Camp Corporation.  Business
Address: 1600 Valley Road, Wayne, NJ  07470.
(7)  President, Carnegie Mellon University.  Business address:  Carnegie
Mellon University, 5000 Forbes Avenue, Pittsburgh, PA  15213.
(8)  Professor of Management, The John E. Anderson Graduate School of
Management.  Business address:  The John E. Anderson Graduate School of
Management, 110 Westwood Plaza, Los Angeles, CA  90024.
(9)  Senior Counsel, Kirkpatrick & Lockhart LLP.  Business address:
Kirkpatrick & Lockhart LLP, 1500 Oliver Building, Pittsburgh, PA  15222.
(10)  Investor.  Address:  P.O. Box 3041, Stateline, NV  89449.
(11)  President, PNC Bank Corp.  Business address:  PNC Bank Corp., One PNC
Plaza, Pittsburgh, PA 15265.
(12)  Chairman of the Board and President, Fayez Sarofim & Co.  Business
address:  Fayez Sarofim & Co., Two Houston Center, Houston, TX  77010.

<PAGE>

                 SCHEDULE 13D, Amendment No. 1

CUSIP NO. 816850 10 1                       Page 11 of 12 Pages
- ---------------------------------------------------------------


                                  EXHIBIT INDEX

Exhibit         Description

   A            Joint  Filing  Agreement  dated  May  29,  1997  by and  between
                Allegheny Teledyne Incorporated and Teledyne, Inc.

<PAGE>


                SCHEDULE 13D, Amendment No. 1

CUSIP NO. 816850 10 1                        Page 12 of 12 Pages
- ----------------------------------------------------------------


                             EXHIBIT A
                       JOINT FILING AGREEMENT
                       ---------------------

            In accordance  with Rule 13d-1(f) under the Securities  Exchange Act
of 1934,  the  undersigned  persons  agree to the joint filing made on behalf of
each of them of a statement on Schedule 13D (including  amendments thereto) with
respect to the Common Stock of Semtech Corporation,  and further agree that this
agreement shall be included as an exhibit to such joint filings.

            Witness the due execution hereof.

DATE:  May 29, 1997               ALLEGHENY TELEDYNE INCORPORATED



                                  By:  /s/ James L. Murdy
                                     ---------------------------
                                     Executive Vice President,
                                     Finance and Administration
                                     and Chief Financial Officer

DATE:  May 29, 1997               TELEDYNE, INC.



                                  By:  /s/ Douglas J. Grant
                                     ---------------------------
                                     Vice President-Finance



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