Document:

<PAGE>
                                                                Exhibit 10.14(b)

                              FIRST LEASE AMENDMENT

This First Lease Amendment ("First AMENDMENT") is entered into as of April 19,
2000 between Semiconductor Components Industries, LLC with offices at 5005 E.
McDowell Road, Phoenix, Arizona 85008 ("SCI") and Motorola, Inc. with offices at
3102 N. 56th Street, Phoenix, Arizona 85018 ("MOTOROLA").

WHEREAS, The parties entered into a lease agreement dated July 31, 1999
(hereinafter the "LEASE") under which SCI leased certain space contained in
multiple buildings located at 52nd Street, Phoenix, Arizona (hereinafter the
"PREMISES") to Motorola; and

WHEREAS, The parties now wish to amend the Lease and extend the Term
(hereinafter the "EXTENSION TERM") with regard to a portion of the space covered
by the Lease as listed and described on Exhibit A-l hereto (hereinafter the
"EXTENSION PREMISES").

NOW, THEREFORE, in consideration of the mutual covenants, terms and provisions
contained herein, the parties agree to amend the Lease as follows:

1.    Exhibit A-l specifically describing the Extension Premises and the
      Extension Term, is attached hereto and incorporated by reference
      herein, into the Lease effective with this First Amendment as to the
      Extension Premises. Exhibit A-l replaces Exhibit A to the Lease as to
      the Extension Premises. Those portions of Exhibit A that do not refer
      to the Extension Premises continue in full force and effect for the
      remainder of the Premises. All references in the Lease to Exhibit A
      shall now apply only to the Premises not part of the Extension Premises.

2.    The reference to "Exhibit A" in Paragraph 1 entitled "Premises" of the
      Lease shall be amended to read: "Exhibit A or Exhibit A-l".

3.    The first sentence of Paragraph 2, entitled "Term" is replaced in its
      entirety as follows:

      The term of this Lease shall commence on 11:59 PM on July 31, 1999 and end
      on 11:59 PM Arizona time on the relocation date specified on Exhibit A or
      Exhibit A-l for the particular Premises or Extension Premises, unless
      otherwise terminated early as provided for herein. Motorola may terminate
      any or all of the Premises listed on Exhibit A at any time (including
      during any renewal periods, if any) upon six (6) months written notice to
      SCI. Motorola may terminate all of the Extension Premises listed on
      Exhibit A-l at any time (including during any renewal periods, if any)
      upon twenty-four (24) months written notice to SCI. If Motorola wishes to
      terminate less than all of the Premises listed on Exhibit A, SCI's advance
      agreement is required, such agreement not to be unreasonably withheld. Any
      such agreement shall be memorialized via email between Silvio Jaconelli of
      SCI and Kathy Downer of Motorola, or their functional replacements.

      The remainder of Paragraph 2, entitled "Term" shall remain the same.
<PAGE>
4.    A new Paragraph 3A entitled Extension Premises Rent, applicable to the
      Extension Premises listed on Exhibit A-t, shall be added to the Lease as
      follows:

      3A.   Extension Premises Rent.

      A.    During the Extension Term hereof, Motorola will pay to SCI rent in
            the annual amount of Eight Million Dollars ($8,000,000) for the
            Extension Premises. The Motorola Rent shall be paid to SCI at the
            office of SCI in monthly installments in advance (or at such other
            time as SCI from time to time may notify Motorola in writing) in the
            amounts as indicated on Exhibit B entitled "RF-1 Lease Schedule
            Years 2000 - 2004" attached to this Lease Amendment and incorporated
            herein. If part of the Extension Premises is terminated as provided
            for herein, the rental rates listed on Exhibit B shall be reduced
            proportionately based on the square footage, as set forth on Exhibit
            A-1, of the portion of Extension Premises terminated, as of the
            agreed upon date of termination.

      B.    The Extension Premises rent does not cover specific charges incurred
            by Motorola for materials or services from the SCI PDQ machine shop
            or the SCI EMRI warehouse. The amount of any such charges and the
            payment terms shall be separately negotiated between the service
            provider and Motorola.

5.    With regard to the Extension Premises only, Paragraphs 3B, 3C, 3D, 3F
      and 30 are eliminated.

6.    Except as modified by this First Amendment, all other terms and conditions
      of the Lease shall remain the same and in full force and effect.

      IN WITNESS WHEREOF, the parties hereby execute this First Lease Amendment.

SCI, LLC                                  MOTOROLA, INC.

By:    /s/ William L. George              By:    /s/ Bill Dunnigan
       -------------------------------           -------------------------------

Name:  WILLIAM L. GEORGE                  Name:  BILL DUNNIGAN
       -------------------------------           ----------------------------

Title: Sr. V.P. & Chief Mfg.              Title: Corp. V.P. & Dir. Die Mfg.
       -------------------------------           ----------------------------
           & Tech. Officer
       -------------------------------

Date:  4/11/00                            Date:  4/11/00
       -------------------------------           ----------------------------
<PAGE>
                                   Exhibit A-l

                                    Premises

<TABLE>
<CAPTION>
                                                Space         Current     Reloc
 Site        Dept              Title            Type            SQ FT     Date
 ----        ----              -----            ----            -----     ----
<S>          <C>       <C>                     <C>            <C>       <C>
52nd St      RH279     RF1 DFO SUPPLY          Office             299   12/31/04
52nd St      RH280     RF1 DFO CIM             Office             597   12/31/04
52nd St      RH281     RF1 DFO PRDPLAN         Office             299   12/31/04
52nd St      RH282     RF1 DFO ADMIN           Office           7,660   12/31/04
52nd St      RH570     RF1 PR ENG PHOT         Office             498   12/31/04
52nd St      RH572     RF1 PR ENG DIFFS        Office             100   12/31/04
52nd St      RH573     RF1 PR ENG IMPLT        Office             100   12/31/04
52nd St      RH574     RF1 PR ENG FRME         Office             299   12/31/04
52nd St      RH575     RF1 PR ENG BKGR         Office             299   12/31/04
52nd St      RH576     RF1 PR ENG PROB         Office             299   12/31/04
52nd St      RH577     RF1 PR ENG ETCH         Office             299   12/31/04
52nd St      RH276     RF1 DFO PROBE           Test/La          7,014   12/31/04
52nd St      RH277     RF1 DFO MAINT           Office          14,931   12/31/04
52nd St      RH270     RF1 DFO PHOTO             Fab            2,417   12/31/04
52nd St      RH271     RF1 DFO ETCH              Fab            5,754   12/31/04
52nd St      RH272     RF1 DFO DIFFUS            Fab            6,690   12/31/04
52nd St      RH273     RF1 DFO IMPLT             Fab            2,511   12/31/04
52nd St      RH274     RF1 DFO FRMETL            Fab            3,468   12/31/04
52nd St      RH275     RF1 DFO BKGRND            Fab            2,189   12/31/04
52nd St      RH579     CSDM ENG SUST           Office             697   12/31/04
52nd St      RH579     CSDM ENG R/E            Office             100   12/31/04
</TABLE>
<PAGE>
                       RF-1 LEASE SCHEDULE YEARS 2000-2004

<TABLE>
<CAPTION>
                                                            2000-2004
---------------------------------------------------------------------------------------------------------------------------------
   JAN       FEB        MAR        APR        MAY        JUNE       JULY       AUG        SEP        OCT         NOV       DEC
---------------------------------------------------------------------------------------------------------------------------------
<S>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
$615,000   $615,000   $770,000   $615,000   $615,000   $770,000   $615,000   $615,000   $770,000   $615,000   $615,000   $770,000
</TABLE>

<TABLE>
<CAPTION>
                                    2000-2004
---------------------------------------------------------------------------------
     Q1               Q2               Q3                Q4             YEAR
---------------------------------------------------------------------------------
<S>              <C>              <C>              <C>              <C>
$2,000,000.00    $2,000,000.00    $2,000,000.00    $2,000,000.00    $8,000,000.00
</TABLE><PAGE>
                                                                Exhibit 10.20(b)

                                                         ON SEMICONDUCTOR
                                                         5005 East McDowell Road
                                                         Phoenix, AZ 85008
                                                         http://onsemi.com

October 1, 2001

William George
3617 E. Camino Sin Nombre
Paradise Valley, AZ  85253

Dear Bill:

      Based on our discussions regarding your plans to retire from ON
Semiconductor Corporation, and Semiconductor Components Industries, L.L.C.
(collectively, the "Company"), we have agreed to modify certain of your
employment and compensation arrangements. This letter agreement is intended to
implement these modifications and to amend your employment agreement, dated
October 27, 1999 (the "Employment Agreement") and any stock option grant
agreements that are currently outstanding regarding Company stock options. In
addition, this letter agreement delineates certain other understandings between
you and the Company. All defined terms herein that are not otherwise defined
herein shall have the meanings ascribed to such terms in the Employment
Agreement.

I.    MODIFICATIONS TO EMPLOYMENT AGREEMENT.

            (a)   The parties hereto hereby agree that the Scheduled Termination
      Date defined in Section 3 of the Employment Agreement shall be changed
      from August 4, 2002 to August 4, 2003, which is the date that you plan to
      retire from the Company.

            (b)   You hereby agree and acknowledge that the recent corporate
      organizational changes do not, and any future organizational changes after
      which you are still employed as an executive of the Company that do not
      reduce the level of salary or bonus provided for in the Agreement will
      not, constitute Good Reason under Section 3(f)(i) of the Employment
      Agreement.

            (c)   Except as specifically provided herein, all other terms and
      conditions provided in the Employment Agreement shall remain in full force
      and effect.

II.   STOCK OPTIONS.

            (a)   The Stock Option Grant Agreements between you and the Company,
      dated November 29, 1999 and February 21, 2001, as well as the Employment
      Agreement, are hereby amended to provide that, if, prior to the Scheduled
      Termination Date (as defined in the Employment Agreement as amended
      hereby) your employment is terminated by the Company without Cause under
      Section 3(d) or 3(f) of the Employment
<PAGE>
William George
October 1, 2001
Page 2

      Agreement, all unvested options shall become immediately and fully vested
      and exercisable. In addition, the Company agrees that all future stock
      options hereafter granted to you will become fully vested and exercisable
      on the earlier of (i) the Scheduled Termination Date (as defined in the
      Employment Agreement) or (ii) the date your employment with the Company is
      terminated without Cause under Section 3(d) or 3(f) of the Employment
      Agreement.

            (b)   Notwithstanding any other provision to the contrary, in the
      event your employment terminates (i) due to your retirement on the
      Scheduled Termination Date, (ii) on account of the termination of your
      employment without Cause under Section 3(d) or 3(f) of the Employment
      Agreement, or (iii) as a result of your death ("Qualifying Termination"),
      all current and future stock options that are granted to you (to the
      extent they are or become exercisable on the date your employment
      terminates) will remain fully exercisable until the first to occur of (1)
      the last day of the three-year period immediately following such
      termination of employment, or (2) the tenth anniversary of the grant date
      of such option.

            (c)   Notwithstanding other provisions to the contrary, in the event
      a Qualifying Termination occurs and the Company achieves a minimum of 85%
      of the Manufacturing and Supply Chain Restructuring Cost Reduction goals
      by December 2002 (described in the Company's Revised Business Plan dated
      June 26, 2001, also referred to as the Bank Plan) then all current and
      future stock options that are granted to you (to the extent they are or
      become exercisable on the date your employment terminates) will remain
      fully exercisable until the first to occur of (1) the last day of the
      five-year period immediately following such termination of employment and
      (2) the tenth anniversary of the grant date of such option.

            (d)   Except as specifically provided herein, all other terms and
      conditions of the Stock Grants and relevant stock option plans shall
      remain in full force and effect.

      Please acknowledge your agreement to the foregoing by signing in the
appropriate space below. This letter agreement shall not be effective unless
executed by each of the parties hereto. A facsimile of a signature shall be
deemed to be and have the same force and effect as an original.

                                          Sincerely,

                                          /S/ STEVE HANSON
                                          Steve Hanson
                                          President

Agreed and Acknowledged:

/S/ WILLIAM GEORGE
William George

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