Document:

<PAGE>

                                                                     Exhibit 4.6

                 FORM OF 15% SENIOR SUBORDINATED NOTE DUE 2010

                               SMTC CORPORATION

     THIS SECURITY BEARS ORIGINAL ISSUE DISCOUNT.  UPON WRITTEN REQUEST TO THE
     VICE PRESIDENT, FINANCE AND ADMINISTRATION, SMTC CORPORATION, 635 HOOD
     ROAD, MARKHAM, ONTARIO, CANADA L3R 4N6, INFORMATION REGARDING THE ISSUE
     PRICE, AMOUNT OF ORIGINAL ISSUE DISCOUNT, ISSUE DATE AND YIELD TO MATURITY
     WILL BE MADE AVAILABLE.

     THIS NOTE WAS ISSUED IN A PRIVATE PLACEMENT, WITHOUT REGISTRATION UNDER THE
     SECURITIES ACT OF 1933, AS AMENDED (THE "ACT") AND MAY NOT BE SOLD,
     ASSIGNED, PLEDGED OR OTHERWISE TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE
     REGISTRATION STATEMENT UNDER THE ACT COVERING THE TRANSFER OR AN OPINION OF
     COUNSEL ACCEPTABLE TO THE ISSUER THAT SUCH REGISTRATION UNDER THE ACT IS
     NOT REQUIRED.

     THIS NOTE IS SUBORDINATED TO AND JUNIOR IN RIGHT OF PAYMENT TO PAYMENT IN
     FULL OF ALL SENIOR INDEBTEDNESS AS DEFINED IN THE SENIOR SUBORDINATED LOAN
     AGREEMENT DATED AS OF MAY __, 2000, AS THE SAME MAY BE AMENDED, MODIFIED,
     RESTATED OR SUPPLEMENTED FROM TIME TO TIME (THE "AGREEMENT") TO THE EXTENT,
     AND IN THE MANNER PROVIDED IN THE AGREEMENT.

$                                                               May   , 2000
 -------                                                            --

     FOR VALUE RECEIVED, the undersigned SMTC Corporation, a Delaware
corporation (the "Company"), hereby promises to pay to                       or
                                                       ----------------------
its registered assigns (the "Payee"), at 11:00 a.m. (New York time) on the
Maturity Date (as defined in the Agreement), the principal sum of

                        United States Dollars (US $         ) or such lesser
-----------------------                            ---------
principal amount thereof as may remain outstanding, in lawful money of the
United States of America in immediately available funds, and to pay interest
from the date hereof on the principal amount hereof from time to time
outstanding at a rate or rates per annum, and payable on such dates, as
determined pursuant to the terms of the Agreement, through the issuance to the
Payee of additional notes substantially in the form attached hereto as Exhibit
A-1 (the "Interest Notes"), each such Interest Note having a stated principal
amount equal to the amount of interest due and payable to the Payee on such
interest payment date and each such Interest Note to be delivered to the Payee
as specified in the Agreement.

     The Company promises to pay interest, on demand, on any overdue principal
and, to the extent permitted by law, overdue interest from their due dates at a
rate or rates determined as set forth in the Agreement.
<PAGE>

     The Company hereby waives diligence, presentment, demand, protest and
notice of any kind whatsoever, other than as expressly required by the
Agreement.  The nonexercise by the holder of any of its rights hereunder in any
particular instance shall not constitute a waiver thereof in that or any
subsequent instance.

     Prior to any transfer of this Note, all payments and prepayments of the
principal hereof shall be endorsed by the holder on the schedule attached hereto
or any continuation thereof; provided, however, that the failure of the holder
hereof to make such a notation or any error in such a notation shall not in any
manner affect the obligations of the Company to make payments of principal and
interest in accordance with the terms of this Note and the Agreement.

     This Note and all obligations of the Company hereunder are subordinated to
and junior in right of payment to the prior payment in full of all Senior
Indebtedness (as defined in the Agreement) on the terms and subject to the
provisions set forth in the Agreement.

     This Note is one of the PIK Notes referred to in the Agreement, which,
among other things, contains provisions for the acceleration of the maturity
hereof upon the happening of certain events, for optional and mandatory
prepayment of the principal hereof prior to the maturity hereof and prepayment
premiums thereon and for the amendment or waiver of certain provisions of the
Agreement, all upon the terms and conditions therein specified.  This Note shall
be construed in accordance with and governed by the laws of the State of
Delaware without giving effect to principles of conflicts of laws.

                         SMTC CORPORATION

                         By:
                             ------------------------------
                             Name:
                             Title:

                                      -2-<PAGE>

Exhibit 10.17
                                                                  Execution Copy
                                                                  --------------

                         WARRANT SUBSCRIPTION AGREEMENT

     This WARRANT SUBSCRIPTION AGREEMENT is made as of  May 18, 2000 between
SMTC Corporation, a Delaware corporation (the "Company"), and each of the
investors listed on Schedule 1 hereto (each a "Subscriber", and collectively,
the "Subscribers").

                                    Recitals
                                    --------

     The Subscribers are willing to purchase, and the Company is willing to
issue and sell to such Subscribers, warrants (the "Warrants") to purchase the
number of units (the "Units") set forth opposite the name of such Subscriber on
Schedule 1 hereto, all on the terms and subject to the conditions set forth
herein.

                                   Agreement
                                   ---------

     In consideration of the foregoing, and the representations, warranties,
covenants and conditions set forth below, the parties hereto, intending to be
legally bound, hereby agree as follows:

  1.   Sale and Purchase of Subscription Securities
       --------------------------------------------

          1.1  On the terms and subject to the conditions hereof, the Company
     hereby agrees to sell to each Subscriber, and by its acceptance hereof each
     Subscriber agrees to purchase from the Company for investment, at the
     Closing hereinafter referred to, a Warrant to purchase the number of Units
     set forth opposite the name of such Subscriber on Schedule 1 hereto, for
     United States Sixty Dollars (US$ 60.00) per Unit.  Each Unit shall consist
     of, subject to adjustment as provided in the Warrants, nine (9) shares of
     the Company's Class A-1 Common Stock, par value $0.001 per share (the
     "Class A Stock") and one (1) share of the Company's Class L Common Stock,
     par value $0.001 per share (the "Class L Stock" and, together with the
     Class A Stock, the "Common Stock").  The Warrants and the shares of Common
     Stock issuable upon the exercise of the Warrants are collectively referred
     to herein as the "Subscription Securities".

          1.2  The sale and purchase of the Warrants (the "Closing") shall take
     place at the same time and location as the Closing and shall be
     substantially contemporaneous with the closing pursuant to, the Senior
     Subordinated Loan Agreement dated as of May __, 2000 between the Company
     and the Lenders (as defined therein) (the "Loan Agreement").
<PAGE>

     If, prior to the Closing hereunder, the Loan Agreement shall be terminated,
     this Agreement shall automatically terminate and be without further force
     and effect; provided, however, that no such termination of this Agreement
     shall relieve any party from liability for breach prior to such
     termination.

          1.3  At the Closing, against payment by a Subscriber to the Company of
     such Subscriber's Warrant Purchase Price (as set forth opposite the name of
     such Subscriber on Schedule 1 hereto) by wire transfer of immediately
     available federal funds, the Company will deliver a Warrant registered in
     the respective name of such Subscriber.

  2.   Representations and Warranties of the Company.  The Company represents
       ---------------------------------------------
and warrants to each Subscriber that:

          2.1  The Company is duly organized, validly existing and in good
     standing under the laws of the State of Delaware.  The Company has made
     available to the Subscribers true and complete copies of the Amended and
     Restated Certificate of Incorporation and By-Laws of the Company and the
     Stockholders Agreement as in effect on the date hereof.  Such documents
     will be in effect in such form on the date of the Closing (the "Closing
     Date").

          2.2  The Company has or prior to the Closing Date will have taken all
     corporate action required to authorize the execution and delivery of this
     Agreement and the issuance of the Subscription Securities.

          2.3  The shares of Common Stock issuable upon the exercise of the
     Warrants, when issued and upon payment of the purchase price therefor, will
     be duly authorized, validly issued, fully paid and non-assessable.

          2.4  Each of the Loan Agreement and this Agreement is a legal, valid
     and binding obligation of the Company, enforceable in accordance with its
     respective terms subject to the effect of bankruptcy, insolvency and
     similar laws affecting creditors' rights generally and to general equitable
     principles.

          2.5  Assuming the accuracy of each Subscriber's representations, the
     offer and sale of the Warrants does not require registration under the
     Securities Act of 1933, as amended.

  3.   Representations and Warranties of the Subscribers.  Each Subscriber
       -------------------------------------------------
individually (but not on behalf of any other Subscriber) represents and warrants
that:

          3.1  Such Subscriber has full legal capacity, power and authority to
     execute and deliver this Agreement and to perform its obligations
     hereunder.  This Agreement has been

                                      -2-
<PAGE>

     duly executed and delivered by such Subscriber and is the legal, valid and
     binding obligation of such Subscriber enforceable against it in accordance
     with the terms hereof.

          3.2  Such Subscriber has been advised that the Subscription Securities
     have not been registered under the Securities Act of 1933, as amended (the
     "Securities Act") or any state securities laws and, therefore, cannot be
     resold unless they are registered under the Securities Act and applicable
     state securities laws or unless an exemption from such registration
     requirements is available.  Such Subscriber is aware that the Company is
     under no obligation to effect any such registration with respect to the
     Subscription Securities (except solely to the extent provided in Section 6
     of the Stockholders Agreement) dated as of July 30, 1999 among the Company
     and the stockholders of the Company party thereto (the "Stockholders
     Agreement") or to file for or comply with any exemption from registration.
     Such Subscriber is purchasing the Subscription Securities to be acquired by
     such Subscriber hereunder for its own account and not with a view to, or
     for resale in connection with, the distribution thereof in violation of the
     Securities Act.  Such Subscriber has such knowledge and experience in
     financial and business matters that such Subscriber is capable of
     evaluating the merits and risks of such investment, is able to incur a
     complete loss of such investment and is able to bear the economic risk of
     such investment for an indefinite period of time.

          3.3  One of the following is true:

                3.3.1  Such Subscriber is either (i) a "qualified institutional
          buyer" as that term is defined in Rule 144A under the Securities Act
          (a "QIB") or (ii) an "accredited investor" as that term is defined in
          Regulation D under the Securities Act, in each case as set forth
          opposite the name of such Subscriber on Schedule I hereto

                ; or

                3.3.2  (i) such Subscriber is not a "U.S. person" (as such term
          is defined in Rule 902(k) under the Securities Act) and is not
          acquiring any Subscription Securities for the account or benefit of a
          U.S. person, (ii) the offer and sale of Subscription Securities to
          such Subscriber has been made in an "offshore transaction" (as such
          term is defined in Rule 902(k) under the Securities Act), and (iii)
          such Subscriber agrees that he will not (a) sell any Subscription
          Securities unless such sale is in accordance with the provisions of
          Regulation S, pursuant to registration under the Securities Act, or
          pursuant to an available exemption from registration or (b) engage in
          hedging transactions with regard to such securities unless in
          compliance with the Securities Act.

                                      -3-
<PAGE>

  4.   Conditions to Sale and Purchase of Warrants.
       -------------------------------------------

          4.1  The Company's obligation to issue and sell the Subscription
     Securities shall be subject to the satisfaction of the following
     conditions:

                4.1.1  All representations and warranties of each Subscriber
          contained in this Agreement shall be true and correct as of the
          Closing, and consummation of the Closing shall constitute a
          reaffirmation by each Subscriber that all representations and
          warranties of such Subscriber contained in this Agreement are true and
          correct as of the Closing.

                4.1.2  On the Closing Date, substantially contemporaneously with
          the issuance and sale of the Warrants hereunder, the closing shall
          have occurred under the Loan Agreement.

          4.2  Each Subscriber's obligation to purchase and pay for the Warrants
     shall be subject to the satisfaction of the following conditions:

                4.2.1  All representations and warranties of the Company
          contained in this Agreement shall be true and correct as of the
          Closing, and consummation of the Closing shall constitute a
          reaffirmation that all the representations and warranties of the
          Company contained in this Agreement are true and correct as of the
          Closing.

                4.2.2  On the Closing Date, substantially contemporaneously with
          the issuance and sale of the Warrants hereunder, all conditions to the
          closing under the Loan Agreement set forth in Section 6 thereof shall
          have been satisfied (without giving effect to any waiver thereof other
          than waivers consented to in writing by such Subscriber).

  5.   Covenants.
       ---------

          5.1  The Company will furnish each registered holder from time to time
     of any of the Subscription Securities representing not less than 10% of the
     outstanding Common Stock (other than any holder of Subscription Securities
     transferred in violation of the Stockholders Agreement or sold in a
     registered public offering or to the public under Rule 144) (each, a
     "Significant Holder"), the following:

                5.1.1   As soon as available, and in any event within one
          hundred and twenty (120) days after the end of each fiscal year of the
          Company, the consolidated balance sheet of the Company and its
          subsidiaries as at the end of each such fiscal year and the
          consolidated statements of income, cash flows and changes in
          stockholders' equity for such year of the Company and its
          subsidiaries, setting

                                      -4-
<PAGE>

          forth in each case in comparative form the figures for the next
          preceding fiscal year, accompanied by the report of independent
          certified public accountants of recognized national standing, to the
          effect that, except as set forth therein, such consolidated financial
          statements have been prepared in accordance with generally accepted
          accounting principles applied on a basis consistent with prior years
          and fairly present in all material respects the financial condition of
          the Company and its Subsidiaries at the dates thereof and the results
          of their operations and changes in their cash flows and stockholders'
          equity for the periods covered thereby.

                5.1.2   As soon as available and in any event within sixty (60)
          days after the end of each fiscal quarter of the Company, the
          consolidated balance sheet of the Company and its subsidiaries as at
          the end of such quarter and the consolidated statements of income,
          cash flows and changes in stockholders' equity for such quarter and
          the portion of the fiscal year then ended of the Company and its
          Subsidiaries, setting forth in each case the figures for the
          corresponding periods of the previous fiscal year in comparative form,
          all in reasonable detail.

          5.2  The Company shall cause to be kept on an appropriate basis, and
     each Significant Holder shall have access at reasonable times to,
     appropriate books, records and accounts.

     6.   Indemnities.  Each Subscriber agrees to indemnify and hold harmless
          -----------
the Company, and the Company agrees to indemnify and hold harmless each
Subscriber, from and against all losses, damages, liabilities and expenses
(including without limitation reasonable attorneys fees and charges) resulting
from any breach of any representation, warranty or covenant of such indemnifying
party or any misrepresentation by such indemnifying party in this Agreement.

     7.   Restrictions on Transfer.
          ------------------------

          7.1  Restrictive Legend.  The certificates or instruments representing
               ------------------
      all Subscription Securities shall bear a legend in substantially the
      following form:

          "The securities represented by this Certificate are subject to
      additional restrictions on transfer and certain other agreements set forth
      in a Stockholders Agreement dated as of July 30, 1999 among SMTC
      Corporation and certain stockholders thereof, a copy of which may be
      obtained without charge by the holder hereof at the Company's principal
      place of business."

      The certificates or instruments representing all Subscription Securities
      sold to Subscribers making the warranty in Section 3.3.1 shall bear a
      legend in substantially the following form:

                                      -5-
<PAGE>

          "The securities represented by this certificate were originally issued
      on May 18, 2000, have not been registered under the Securities Act of
      1933, as amended (the "Act"), or under any state securities laws and may
      not be sold or transferred in the absence of an effective registration
      statement under the Act and applicable state securities laws or an
      exemption from registration thereunder."

      The certificates or instruments representing all Subscription Securities
      sold to Subscribers making the warranty in Section 3.3.2 shall bear a
      legend in the following form:

          "The securities represented by this certificate were originally issued
      on May 18, 2000 in reliance on Regulation S under the Securities Act of
      1933, as amended (the "Act"), and may not be sold or transferred except in
      accordance with the provisions of Regulation S, or pursuant to an
      available exemption from registration. Hedging transactions involving the
      securities represented by this certificate may not be conducted unless in
      compliance with the Act."

          7.2  Termination of Restrictions.  The restrictions imposed by Section
               ---------------------------
      7.1 hereof upon the transferability of Subscription Securities shall cease
      and terminate as to any particular Subscription Securities (i) when, in
      the opinion of counsel reasonably acceptable to the Company, such
      restrictions are no longer required in order to assure compliance with the
      Securities Act or (ii) when such Subscription Securities shall have been
      registered under the Securities Act or transferred pursuant to Rule 144(k)
      thereunder. Whenever (i) such restrictions shall cease and terminate as to
      any Subscription Securities or (ii) such Subscription Securities shall be
      transferable under paragraph (k) of Rule 144, the holder thereof shall be
      entitled to receive from the Issuer, without expense, new certificates not
      bearing the legend set forth in Section 7.1 hereof.

  8.   Miscellaneous.
       -------------

          8.1  This Agreement and the other agreements referred to herein set
      forth the entire understanding among the parties with respect to the
      subject matter thereof.

          8.2  This Agreement can be changed only by an instrument in writing
      signed by the party against whom enforcement of such change is sought.

          8.3  This Agreement shall bind and inure to the benefit of the parties
      hereto and their respective successors, assigns, heirs and
      representatives; provided, however, that prior to the Closing, no
      Subscriber may assign any of such Subscriber's rights hereunder and, after
      the Closing, no Subscriber may assign any of such Subscriber's rights
      hereunder except in connection with a transfer of the Subscription
      Securities in compliance with the terms and conditions of the Stockholders
      Agreement.

                                      -6-
<PAGE>

          8.4  All covenants, agreements, representations and warranties made
      herein shall survive the execution and delivery hereof and transfer of any
      Subscription Securities.

          8.5  This Agreement may be executed in any number of counterparts,
      each of which shall be deemed an original but all of which shall together
      constitute one and the same instrument.

  9.  Governing Law; Arbitration.
      --------------------------

          9.1    Governing Law.  This Agreement shall be governed by and
                 -------------
      construed in accordance with the domestic substantive laws of the State of
      Delaware, without giving effect to any choice or conflict of law provision
      or rule that would cause the application of the domestic substantive laws
      of any other jurisdiction; provided, however, that any dispute covered by
      the provisions of Section 9.2 shall be governed by the United States
      Arbitration Act as then in force.

          9.2    Arbitration.
                 -----------

          9.2.1   Generally.  Except solely as set forth in Section 9.2.3, each
                  ---------
      dispute, difference, controversy or claim arising in connection with or
      related or incidental to, or question occurring under, this Agreement or
      the subject matter hereof shall be finally settled under the Commercial
      Arbitration Rules of the American Arbitration Association (the "AAA") by
      an arbitral tribunal composed of three arbitrators, at least one of whom
      shall be an attorney experienced in corporate transactions, appointed by
      agreement of the parties in accordance with said Rules. In the event the
      parties fail to agree upon a panel of arbitrators from the first list of
      potential arbitrators proposed by the AAA, the AAA will submit a second
      list in accordance with said Rules. In the event the parties shall have
      failed to agree upon a full panel of arbitrators from said second list,
      any remaining arbitrators to be selected shall be appointed by the AAA in
      accordance with said Rules. If, at the time of the arbitration, the
      parties agree in writing to submit the dispute to a single arbitrator,
      said single arbitrator shall be appointed by agreement of the parties in
      accordance with the foregoing procedure, or, failing such agreement, by
      the AAA in accordance with said Rules. The arbitrator(s) will entertain
      such presentation of sworn testimony and other evidence, written briefs,
      and/or oral argument as the parties may wish to present; provided,
      however, no testimony or exhibits will be admissible unless the adverse
      party was afforded an opportunity to examine such witnesses and to inspect
      and copy such exhibits during the pre-arbitration proceeding discovery
      phase. Upon the request of either party, the arbitrator(s) will provide
      both parties with written findings of fact and conclusions of law. The
      foregoing arbitration proceedings may be commenced by any party by notice
      to all other parties. In any arbitration proceedings under this Section 9,
      the arbitrator(s) shall be instructed to begin such proceedings within 30
      days of appointment, and

                                      -7-
<PAGE>

      to reach a decision within 45 days of the conclusion of the submission of
      all evidence and, in the event that a decision is not so rendered, the
      arbitrator shall lose all jurisdiction over such dispute.

          9.2.2  Place of Arbitration.  The place of arbitration shall be
                 --------------------
     Boston, Massachusetts.

          9.2.3  Recourse to Courts.  The parties hereby exclude any right of
                 ------------------
     appeal to any court on the merits of the dispute.  The provisions of this
     Section 9.2 may be enforced in any court having jurisdiction over the award
     or any of the parties, jurisdiction pursuant to Section 9.3 below, or any
     of their respective assets and judgment on the award (including without
     limitation equitable remedies) granted in any arbitration hereunder may be
     entered in any such court.  Nothing contained in this Section 9 shall
     prevent any party from seeking interim measures of protection in the form
     of pre-award attachment of assets or preliminary or temporary equitable
     relief.

     9.3    Consent to Jurisdiction.  Subject to the provisions of Section 9.2,
            -----------------------
  each of the parties agrees that all actions, suits or proceedings arising out
  of or based upon this Agreement or the subject matter hereof may be brought
  and maintained in the federal and state courts of the State of Delaware.
  Subject to the provisions of Section 9.2, each of the parties hereto by
  execution hereof (i) hereby irrevocably submits to the jurisdiction of the
  federal and state courts in the State of Delaware for the purpose of any
  action, suit or proceeding arising out of or based upon this Agreement or the
  subject matter hereof and (ii) hereby waives to the extent not prohibited by
  applicable law, and agrees not to assert, by way of motion, as a defense or
  otherwise, in any such action, suit or proceeding, any claim that he or it is
  not subject personally to the jurisdiction of the above-named courts, that he
  or it is immune from extraterritorial injunctive relief or other injunctive
  relief, that his or its property is exempt or immune from attachment or
  execution, that any such action, suit or proceeding may not be brought or
  maintained in one of the above-named courts, that any such action, suit or
  proceeding brought or maintained in one of the above-named courts should be
  dismissed on grounds of forum non conveniens, should be transferred to any
  court other than one of the above-named courts, should be stayed by virtue of
  the pendency of any other action, suit or proceeding in any court other than
  one of the above-named courts, or that this Agreement or the subject matter
  hereof may not be enforced in or by any of the above-named courts.  Each of
  the parties hereto hereby consents to service of process in any such suit,
  action or proceeding in any manner permitted by the laws of the State of
  Delaware, agrees that service of process by registered or certified mail,
  return receipt requested, at the address specified in or pursuant to Schedule
  I hereto is reasonably calculated to give actual notice and waives and agrees
  not to assert by way of motion, as a defense or otherwise, in any such action,
  suit or proceeding any claim that such service of process does not constitute
  good and sufficient service of process.

                                      -8-
<PAGE>

     9.4    Waiver of Jury Trial.  To the extent not prohibited by applicable
            --------------------
  law which cannot be waived, each of the parties hereto hereby waives, and
  covenants that it will not assert (whether as plaintiff, defendant, or
  otherwise), any right to trial by jury in any forum in respect of any issue,
  claim, demand, cause of action, action, suit or proceeding arising out of or
  based upon this Agreement or the subject matter hereof, in each case whether
  now existing or hereafter arising and whether in contract or tort or
  otherwise. Any of the parties hereto may file an original counterpart or a
  copy of this Section 9.4 with any court as written evidence of the consent of
  each of the parties hereto to the waiver of his or its right to trial by jury.

     9.5    Reliance.  Each of the parties hereto acknowledges that he or it has
            --------
  been informed by each other party that the provisions of Section 9 constitute
  a material inducement upon which such party is relying and will rely in
  entering into this Agreement and the transactions contemplated hereby.

                                      -9-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto, intending to be legally bound by
the terms hereof, have caused this Agreement to be executed, under seal, as of
the date first above written by their officers or other representatives
thereunto duly authorized.

THE COMPANY:                  SMTC CORPORATION

                              By: /s/ Richard Smith
                                  ---------------------------------
                                  Title: Vice President Finance and
                                         Administration

THE SUBSCRIBERS:              SMTC CORPORATION

                              By: /s/ Richard Smith
                                  ---------------------------------
                                  Name:  Richard Smith
                                  Title: Vice President Finance and
                                         Administration

                              BAIN CAPITAL FUND, VI L. P.

                              By: Bain Capital Partners VI, L. P..,
                               its general partner

                              By: Bain Capital Investors VI, Inc.
                               its general partner

                              By: /s/ Paul B. Edgerley
                                  ---------------------------------
                                  Name:  Paul B. Edgerley
                                  Title: Managing Director

                              BCIP ASSOCIATES II
                              BCIP ASSOCIATES II-B
                              BCIP ASSOCIATES II-C

                              By: Bain Capital, Inc.
                               their Managing Partner

                              By: /s/ Paul B. Edgerley
                                  ---------------------------------
                                  Name:  Paul B. Edgerley
                                  Title: Managing Director

                                      -10-
<PAGE>

                              CELERITY PARTNERS III, L. P.

                              By: Celerity Management Co., Inc.
                               their Attorney-in-Fact

                              By: /s/ Stephen Adamson
                                  ---------------------------------
                                  Name:  Stephen Adamson
                                  Title: President

                              VENTEURA LIMITED

                              By: /s/ Albin A. Johann
                                  ---------------------------------
                                  Name: Albin A. Johann
                                  Title: Director

                              CFE, Inc.

                              By: /s/ John Goodwin
                                  ---------------------------------
                                  Name:  John Goodwin
                                  Title: Duly Authorized Signatory

                              P. N. WALKER CONSULTING, INC.

                              By: /s/ Paul Walker
                                  ---------------------------------
                                  Name: Paul Walker
                                  Title: President

                              NICHAL INC.

                              By: /s/ Derek D'Andrade
                                  ---------------------------------
                                  Name:  Derek D'Andrade
                                  Title: President

                              /s/ Philip Woodard
                              ---------------------------------
                              Philip Woodard

                                      -11-
<PAGE>

                              KILMER ELECTRONICS GROUP LIMITED

                              By: /s/ Michael Griffiths
                                  ---------------------------------
                                  Name:  M. Griffiths
                                  Title: Secretary-Treasurer

                                      -12-
<PAGE>

                                   SCHEDULE 1
                      to Warrant  Subscription  Agreement
                      -----------------------------------

<TABLE>
<CAPTION>
                                                                         QIB, large instiutional
                                                         Warrant        accredited investor, or
            Name of Subscriber               Units    Purchase Price        Non-U.S. Person
---------------------------------------------------------------------------------------------------
<S>                                         <C>       <C>             <C>
Bain Capital Fund VI, L.P.                   9008.76     $540,525.90  Qualified Institutional
Bain Capital, Inc.                                                    Buyer
Two Copley Place, 7/th/ Floor
Boston, MA 02116
Attn:
---------------------------------------------------------------------------------------------------
BCIP Associates II                          3,286.21     $197,172.87  Qualified Institutional Buyer
Bain Capital, Inc.
Two Copley Place, 7/th/ Floor
Boston, MA 02116
Attn:
---------------------------------------------------------------------------------------------------
BCIP Associates II-B                          550.45     $ 33,027.16  Large Institutional
Bain Capital, Inc.                                                    Accredited Investor
Two Copley Place, 7/th/ Floor
Boston, MA 02116
Attn:
---------------------------------------------------------------------------------------------------
BCIP Associates II-C                          402.75     $ 24,165.12  Large Institutional
Bain Capital, Inc.                                                    Accredited Investor
Two Copley Place, 7/th/ Floor
Boston, MA 02116
Attn:
---------------------------------------------------------------------------------------------------
Celerity Partners III, L.P.                 7,987.67     $479,260.27  Large Institutional
Celerity Management Co., Inc.                                         Accredited Investor
11111 Santa Monica Boulevard
Suite 1127
Los Angeles, CA 90025
Attn:   Stephen Adamson
---------------------------------------------------------------------------------------------------
Venteura Limited                            2,582.17     $154,930.38  Non-U.S. Person
c/o Jura Trust
Mitteldorf  1
Vaduz, Liechtenstein, FL-9490
Attention:  Albin A. Johann

Telephone:  41-75-237-7575
Facsimile:  41-75-232-1362
---------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
                                                                         QIB, large instiutional
                                                         Warrant        accredited investor, or
            Name of Subscriber               Units    Purchase Price        Non-U.S. Person
---------------------------------------------------------------------------------------------------
<S>                                         <C>       <C>             <C>
CFE, Inc.                                     601.29     $ 36,077.31  Qualified Institutional Buyer
c/o General Electric Capital Corporation
 Commercial Finance
201 High Ridge Road
Stamford, CT 06296
Attn: Corporate Counsel
---------------------------------------------------------------------------------------------------
Kilmer Electronics Group Limited            7,580.05     $454,802.88  Non-U.S. Person
Kilmer Van Nostrand Co. Limited
50 Ashwarren Road
Downsview, Ontario, Canada M3J 1Z5
Attention:  Michael Griffiths
---------------------------------------------------------------------------------------------------
P. N. Walker Consulting                     4,409.92     $264,595.34  Non-U.S. Person
c/o SMTC Corporation
635 Hood Road
Markham, Ontario, Canada L3R 4N6
---------------------------------------------------------------------------------------------------
Nichal Inc.                                 4,409.92     $264,595.34  Non-U.S. Person
c/o SMTC Corporation
635 Hood Road
Markham, Ontario, Canada L3R 4N6
---------------------------------------------------------------------------------------------------
Philip Woodard                                847.46     $ 50,847.42  Non-U.S. Person
c/o SMTC Corporation
635 Hood Road
Markham, Ontario, Canada L3R 4N6
---------------------------------------------------------------------------------------------------
</TABLE>

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