Document:

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                                                                Exhibit 10.21(b)

                          ON SEMICONDUCTOR CORPORATION
                   SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

                                                November 28, 2001

Dario Sacomani
10457 E. Sunnyside Dr.
Scottsdale, AZ 85259

Dear Dario:

Given the present difficult industry and the general economic conditions, the
relatively short time remaining on your employment agreement dated as of October
27, 1999 (the "Employment Agreement"), and the Board's satisfaction with your
service as Chief Financial Officer, Senior Vice President and Treasurer, the
Board desires to secure an extension of your period of service to ON
Semiconductor Corporation and Semiconductor Components Industries, L.L.C.
(collectively, the "Company"). This letter agreement ("Letter Agreement") is
intended to implement certain modifications to the Employment Agreement and any
stock option grants 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 used 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 to amend Section 2(a) to provide for
      a Base Salary of $260,000 per annum.

      (b)   The opening paragraph of Section 3 shall be deleted in its entirety
      and replaced with the following:

            The Employment Period has commenced on August 4, 1999 (the
      "Effective Date") and shall terminate on December 31, 2003 (the "Scheduled
      Termination Date"), unless terminated sooner pursuant to this Section 3,
      provided that the Employment Period shall be extended automatically for
      successive one-year periods beginning on the Scheduled Termination Date
      (and the Scheduled Termination Date shall be the next succeeding
      anniversary) unless written notice of an election not to extend the
      Employment Period is served by either party on the other party at least
      thirty (30) days prior to the date this Agreement would otherwise expire
      absent an extension.

      (c)   Section 5(a) is deleted in its entirety and is replaced with the
      following:

            (a)   Without Cause. In the event of the termination of the
      Executive employment during the Employment Period by the Company without
      Cause under Section 3(d) (including a deemed termination without Cause as
      provided in Section 3(f) herein, except as provided below) of this
      Employment Agreement, in addition to the Executive's accrued but unused
      vacation and Base Salary through the Date of Termination (to the extent
      not
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      theretofore paid), all shares underlying the Option shall become
      immediately exercisable, and the Executive shall be entitled to a lump-sum
      payment, payable within thirty (30) days after the Date of Termination,
      equal to the product of (A) two and (B) the sum of (x) the highest rate of
      the Executive's annualized Base Salary in effect at any time up to and
      including the Date of Termination and (y) the higher of (I) the Annual
      Bonus paid to the Executive in the year immediately preceding the year in
      which the Date of Termination occurs or (II) the Executive Target Bonus
      Amount (as defined below) times a fraction, the numerator of which is the
      number of calendar quarters in the immediately preceding four full
      calendar quarters in which the Company met or surpassed its financial
      projections and performance objectives as previously approved by the Board
      or its designee in its sole discretion, pursuant to the Company's annual
      bonus plan or program in effect during the relevant period, and the
      denominator of which is four; provided that the payments and benefits
      provided herein are subject to and conditioned upon the Executive
      executing a valid and effective general release and waiver (in the form
      reasonably acceptable to the Company), waiving all claims the Executive
      may have against the Company, its successors, assigns, affiliates,
      executives, officers and directors, and such payments and benefits are
      subject to and conditioned upon the Executive's compliance with the
      restrictive covenants provided in Sections 8 and 9 hereof. Except as
      provided in this Section 5(a) and Sections 2(d), 6 and 9(c), to the extent
      applicable, the Company shall have no additional obligations under this
      Agreement. For purposes of this Section 3, "Executive Target Bonus Amount"
      shall mean sixty percent (60%) times the Executive's Base Salary or such
      higher amount as is designated as the "target" bonus amount by the Board
      or its designee in its sole discretion, pursuant to the Company's annual
      bonus plan or program in effect during the relevant period.
      Notwithstanding the foregoing, in the event of a deemed termination
      without Cause by reason of the Executive's election to terminate his
      employment within one year following a Change in Control as provided in
      Section 3(f)(iii) hereof, the shares underlying the Option shall remain
      subject to the vesting and exercisability provisions in effect immediately
      prior to such Change in Control.

      (d)   In Section 12(a), each occurrence of "Semiconductor Components
      Industries, LLC" shall be changed to "ON Semiconductor Corporation."

      (e)   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)   Notwithstanding any provision in the Employment Agreement, the SCG
      Holding Corporation 1999 Founders Stock Option Plan (the "Founder's Plan")
      or the ON Semiconductor Corporation 2000 Stock Incentive Plan (the "2000
      SIP" and together with the Founder's Plan, the "Option Plans") (or any
      provision in any stock option agreement thereunder in effect between you
      and the Company) to the contrary, all stock options that are held by you
      as of the date hereof (the "Current Options") shall vest according to
      their original terms and shall not accelerate on a change in control (as
      defined in the Employment Agreement or in the Option Plans); provided that
      in the event your employment is terminated within the two-year period
      following a change in control by you for Good Reason (within the meaning
      of Section 3(f) of the Employment Agreement (other than by

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      reason of your election to terminate your employment following a change in
      control as provided in Section 3(f)(iii) thereof)) or by the Company
      without Cause, the Current Options shall become immediately exercisable.
      This Section II(a) shall constitute consent for purposes of Section
      4.13(a) of the Founders Plan and Section 15.2 of the 2000 SIP.

      (b)   The provisions of Section II(a) of this Letter Agreement shall apply
      equally to each stock option granted to you after the date hereof. In the
      event a stock option agreement evidencing any such future stock option
      contains a contrary provision, unless such stock option agreement
      specifically provides that it is intended to supersede this Letter
      Agreement, this Letter Agreement shall control the terms on which such
      option may accelerate in the event of a change in control.

      (c)   Notwithstanding any other provision to the contrary, in the event
      your employment terminates (i) on account of the Company terminating your
      employment without Cause under Section 3(d) of the Employment Agreement
      (including a deemed termination without Cause as provided in Section 3(f)
      therein) or (ii) as a result of your death or Disability, 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 two
      (2) 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 option agreements, the Option Plans and the
      Employment Agreement 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 be effective as of January 1, 2002
provided that it is 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,
                                          ON SEMICONDUCTOR CORPORATION
                                          SEMICONDUCTOR COMPONENTS
                                                INDUSTRIES, LLC

                                          By:  /s/  Steve Hanson
                                               --------------------------------

                                          Its:      CEO
                                               --------------------------------

Agreed and acknowledged to as of the first date written above:

 /s/  Dario Sacomani
----------------------------
      DARIO SACOMANI

                                       3<PAGE>

                                                                   Exhibit 10.48

                              Rockford Corporation
                             2002 Stock Option Plan

1.    Purpose.

      The Rockford Corporation 2002 Stock Option Plan is intended to assist in
      attracting and retaining employees and directors and to motivate such
      individuals to use their best efforts on behalf of the Corporation.

2.    Definitions.

      The following terms have the following meanings:

      2.1   "1933 Act" means the Federal Securities Act of 1933 and applicable
            state securities laws.

      2.2   "1934 Act" means the Securities Exchange Act of 1934.

      2.3   "Board" means the Board of Directors of Rockford Corporation.

      2.4   "Code" means the Internal Revenue Code of 1986.

      2.5   "Committee" means the Compensation Committee of the Board of
            Directors of Rockford Corporation.

      2.6   "Corporation" means Rockford Corporation and any Subsidiary.

      2.7   "Fair Market Value" means, as applied to a specific date, the
            closing price for the Stock on such date as reported on the
            principal stock exchange upon which the Corporation's Stock is
            listed, currently, the Nasdaq Stock Market--National Market System
            ("NASDAQ"); or, if the stock is not listed, then the mean between
            the most recent bid and asked prices of any other recognized trading
            market or if no stock was traded on the relevant date, on the next
            preceding day on which the Stock was so traded. If no such market
            exists, then the Committee shall determine in good faith the fair
            market value of the Stock.

      2.8   "Grant Date" means the date on which an Option is granted as
            specified by the Committee, contingent on the Optionee executing a
            Stock Option Agreement in form satisfactory to the Committee.

      2.9   "Incentive Option" means an Option eligible for tax treatment as an
            incentive option under Section 422 of the Code.
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      2.10  "Non-Qualified Option" means an Option that is not eligible for tax
            treatment as an incentive option under Section 422 of the Code.

      2.11  "Option" means an option to purchase Stock granted under this Plan.

      2.12  "Optionee" means an employee or director to whom an Option has been
            granted under the Plan.

      2.13  "Plan" means the Rockford Corporation 2002 Stock Option Plan, the
            terms and conditions of which are covered in this instrument.

      2.14  "Stock" means the common stock of the Corporation.

      2.15  "Stock Option Agreement" means a written agreement entered into
            between the Corporation and the Optionee that provides for the price
            and terms of an Option.

      2.16  "Subsidiary" means any corporation of which the majority of the
            outstanding capital stock is owned, directly or indirectly, by the
            Corporation and which meets the definition of a subsidiary
            corporation as set forth in Section 424(f) of the Code, at the time
            of the granting of the Option.

      2.17  "Ten Percent Shareholder" means an individual who owns more than 10%
            of the total combined voting power of all classes of stock of the
            Corporation.

3.    Administration.

      3.1   The Plan shall be administered by the Compensation Committee of the
            Board, which Committee shall satisfy the requirements for "outside
            directors" as set forth in section 162 (m) of the Code and
            "non-employee directors" as set forth in rule 16b-3 of the 1934 Act.
            Without limiting the powers of the Committee, the Committee shall
            have the power to determine the times during which any Option shall
            be exercisable, the events upon which any Option shall terminate,
            the amounts, if any, payable to beneficiaries of an Optionee upon
            the death of such Optionee, the exercisability of any Option on the
            sale of all, or substantially all, of the assets of the Corporation,
            or a merger where the Corporation is not the surviving corporation
            (other than a merger that is only a change in form), and other terms
            of exercise. No member of the Committee shall be eligible to vote on
            the grant of Options to him or her. All decisions and determinations
            of the Committee in administering the Plan shall be final.

      3.2   If changes are made to the Code that make it advisable, in the
            Committee's sole discretion, to change the character of Options for
            income tax purposes, the Committee may change the character of
            Options and may impose on Options any conditions deemed necessary or
            appropriate to comply with the Code requirements. However, except as
            otherwise provided herein, the Committee may

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            not change the character or terms of an outstanding Option without
            the Optionee's consent.

      3.3   The Committee, subject to the provisions of the Plan, shall make
            determinations regarding:

            (a)   The employees or directors who shall receive Options, the
                  times when such Options shall be granted, the time limits
                  within which Options may be exercised, the number of shares
                  subject to each Option, and the terms and provisions of Stock
                  Option Agreements (which need not be identical);

            (b)   Interpretation of Plan provisions;

            (c)   Rules and regulations relating to the Plan;

            (d)   Stock Option Agreements under the Plan; and

            (e)   Other determinations advisable for the proper administration
                  of the Plan.

4.    Tax and Other Characteristics of Options.

      4.1   Options granted pursuant to the Plan may be designated, but need not
            be designated, as Incentive Options. The Stock Option Agreement
            shall provide whether an Option is an Incentive Option or a
            Non-Qualified Option. In the case of Incentive Options, the
            aggregate fair market value of the Stock (at the time the Option is
            granted) for Options that are exercisable for the first time by an
            Optionee during any calendar year (under all stock option plans of
            the Corporation or Subsidiary) shall not exceed $100,000.
            Non-employee directors of the Corporation or Subsidiary shall not be
            eligible for the grant of Incentive Options.

      4.2   At all times during the period beginning on the date of grant of the
            Incentive Stock Option and ending on the day three months before the
            date of exercise of an Incentive Stock Option, the Optionee must be
            an Employee of the Corporation or a Subsidiary. Such 3-month period
            shall be extended to twelve (12) months if employment ends due to a
            total disability. Additional limitations may be imposed by the terms
            of the Option Agreement.

5.    Stock Subject to the Plan.

      5.1   Subject to adjustments under Section 11, the aggregate number of
            shares of Stock that may be issued on the exercise of Options shall
            not exceed 600,000 and the maximum number of shares for which
            Options may be granted to any one employee shall be 200,000. Such
            Stock may be authorized but unissued shares or treasury shares, as
            the Committee determines.

                                      -3-
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      5.2   If an Option expires or is terminated, the shares of Stock allocated
            for issuance under such Option may be allocated to a new Option
            under the Plan.

6.    Eligibility.

      All individuals who are officers, directors, advisory directors or
      employees of the Corporation or a Subsidiary, including employees who are
      officers or directors, shall be eligible for selection by the Committee to
      receive Options under the Plan. Only officers and employees of the
      Corporation or a Subsidiary may receive Incentive Options under the Plan.

7.    Option Exercise Price and Payment of Withholding Taxes.

      The Committee shall determine the price at which shares of Stock may be
      purchased on the exercise of any Option at the time an Option is granted.
      The price shall not be less than 100% of the fair market value of the
      Stock at the Grant Date, but if the Corporation desires to grant an
      Incentive Option to a Ten Percent Shareholder, the price at which shares
      may be purchased under such Option shall not be less than 110% of the fair
      market value of the Stock at the Grant Date. Also, any eligible individual
      shall pay to the Corporation (or make arrangements for such payment) any
      applicable federal and state income and withholding taxes the Corporation
      determines are payable on the spread between the fair market value of the
      Stock at the date of exercise and the Option price.

8.    Term of Options.

      The Committee shall determine the term of each Option at the Grant Date.
      In no case, however, shall the term of any Option exceed ten years from
      the Grant Date, or five years in the case of a grant of an Incentive
      Option to a Ten Percent Shareholder.

9.    Payment on Exercise of Options.

      The price of an exercised Option and any taxes required to be paid by the
      Optionee on exercise of such Option shall be paid:

            (a)   In cash; or

            (b)   At the discretion of the Committee, through the delivery of
                  Stock with a fair market value equal to the exercise price and
                  withholding taxes, if any; or

            (c)   At the discretion of the Committee, through a combination of
                  (a) and (b).

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10.   Non-Transferability of Options.

            (a)   Except as provided in (b), below, Options shall not be
                  transferable by the Optionee, but if an Optionee dies, his or
                  her personal representative may exercise an Option within 90
                  days of the date of the Optionee's death.

            (b)   Options may be transferable pursuant to a valid decree of
                  divorce; provided, however, that any Incentive Options
                  required to be so transferred shall cease to be Incentive
                  Options and become Non-Qualified Options.

11.   Adjustments.

      If the Corporation:

            (a)   declares a dividend or makes a distribution on its Stock
                  payable in Stock or securities convertible into Stock; or

            (b)   recapitalizes through a split-up of the outstanding shares of
                  Stock into a greater number or a combination of the
                  outstanding Stock into a lesser number; or

            (c)   issues, by reclassification of its Stock, any share of Stock,
                  or

            (d)   reorganizes, merges, consolidates, splits-up, combines, or
                  exchanges shares or engages in any similar transaction to
                  those described in this Section 11 with respect to the Stock,

      the Committee shall make appropriate and equitable adjustments in the
      number and kind of shares subject to outstanding Options under the Plan.
      Any other adjustments to the Options shall be within the sole discretion
      of the Committee. If the adjustment would produce fractional shares with
      respect to any unexercised Option, the Committee may adjust appropriately
      the number of shares covered by the Option to eliminate the fractional
      shares. The price of any shares subject to an outstanding Option shall be
      adjusted so there will be no change in the aggregate purchase price
      payable upon the exercise of the Option, and such price may be changed at
      the Committee's discretion, to avoid any substantial dilution or
      enlargement of the rights granted or available to Optionees under the Plan
      or to shareholders of the Corporation.

12.   Additional Restrictions.

      Notwithstanding any other provisions of the Plan, any Stock Option
      Agreement may contain such additional or more restrictive provisions as
      the Committee deems advisable and consistent with the Plan.

                                      -5-
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13.   Registration.

      The Plan, the Stock to be issued pursuant to the exercise of Options, or
      the Options granted under the Plan, may be registered under the Act.

14.   Effective Date of Plan.

      The Plan shall become effective as of January 23, 2002 and shall remain in
      effect for ten years from its effective date, unless the Board terminates
      it earlier. No Incentive Options may be issued under the Plan unless the
      stockholders of the Corporation approve the Plan within one year from the
      date the Plan is adopted by the Corporation.

15.   Amendments and Termination.

      The Board, in its discretion and at any time, may modify, amend or
      terminate the Plan. Neither the termination of the Plan, nor any
      modification or amendment thereof, shall adversely affect any rights under
      an Option previously granted under the Plan without the consent of the
      Optionee except as provided in the Plan and except that, if the
      Corporation merges into, consolidates, or sells substantially all of its
      assets to another entity, the Corporation may terminate any outstanding
      Options without such consent. Notwithstanding the foregoing, the Board may
      amend the Plan to the extent necessary to cause Options granted under the
      Plan to meet the requirements of the Act and the Code and regulations
      thereunder.

16.   Miscellaneous.

            (a)   Nothing in the Plan or any Option granted shall confer upon
                  any person any right to continue in the service of the
                  Corporation or a Subsidiary.

            (b)   The grant of Options under the Plan, the issuance and delivery
                  of shares upon the exercise of Options, and any other matters
                  relating thereto shall be subject to all laws, rules and
                  regulations as may from time to time be applicable, including
                  but not limited to, any and all rules and regulations of any
                  stock exchange or exchanges upon which the shares of the
                  Corporation may be listed and all applicable federal and state
                  securities laws.

            (c)   No person shall acquire any rights as an Optionee under this
                  Plan unless and until a Stock Option Agreement in the form and
                  containing the terms specified by the Committee shall have
                  been duly executed on behalf of the Corporation by such
                  officer or officers as the Committee shall designate for such
                  purpose, delivered to the Optionee named therein, and executed
                  by the Optionee.

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            (d)   No person shall have any rights as a shareholder with respect
                  to any shares covered by an Option granted pursuant to the
                  Plan until the date of the issuance of a share certificate to
                  the Optionee for such shares.

17.   Governing Law.

      All rights under this Plan shall be governed by and construed in
      accordance with the laws of the state of Arizona. The Plan is intended to
      comply with all applicable securities laws and to meet the requirements
      for Incentive Stock Options and the "performance-based" exception to
      section 162(m) of the Code, and the Plan shall be construed and
      interpreted in a manner that reflects such intent.

18.   Execution.

      The President of the Corporation has been authorized to execute this Plan
      and has executed the Plan on the date indicated below.

                                          ROCKFORD CORPORATION

                                          -------------------------------------
                                          President

                                          -------------------------------------a
                                          Date

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