Exhibit 3.1

SMTC Corporation

THIRD AMENDED AND RESTATED

Certificate of Incorporation

Pursuant to Section 241 of the General Corporation Law of the State of Delaware, SMTC Corporation (hereinafter referred to as the Corporation) has adopted this Third Amended and Restated Certificate of Incorporation
further restating and amending its Certificate of Incorporation (originally filed on July 31, 1998). This Third Amended and Restated Certificate of Incorporation (the Certificate of Incorporation), which restates and further
amends the provisions of this Corporations Second Amended and Restated Certificate of Incorporation (filed on July 27, 2000), as amended by a Certificate of Amendment (filed on May 21, 2004), a Certificate of Correction (filed on
June 18, 2004) and a Certificate of Amendment (filed on September 13, 2004), was duly proposed by the board of directors of the Corporation (the Board of Directors) and adopted by affirmative vote of the requisite number
of Stockholders of the Corporation, in accordance with the applicable provisions of Sections 242 and 245 of the General Corporation Law of the State of Delaware.

ARTICLE I

The name of the Corporation is SMTC Corporation.

ARTICLE II

The registered
office of this corporation in the State of Delaware is located at 1013 Centre Road, in the City of Wilmington, County of New Castle. The name of its registered agent at such address is Corporation Service Company.

ARTICLE III

The purpose of
this Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware (the DGCL).

ARTICLE IV

The total number of shares of all classes of stock which the
Corporation shall have authority to issue is 31,000,000 shares, consisting of (i) 26,000,000 shares of Common Stock, $0.01 par value per share (Common Stock), and (ii) 5,000,000 shares of Preferred Stock, $0.01 par value
per share (Preferred Stock).

The following is a statement of the designations and the powers, privileges and rights,
and the qualifications, limitations or restrictions thereof in respect of each class of capital stock of the Corporation.



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| | 1. | Common Stock.
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| | A. | General. Subject to the powers, preferences and rights of any Preferred Stock, including any series thereof, having any preference or priority over, or rights superior to,
the Common Stock and except as otherwise provided by law and this Article, the holders of the Common Stock shall have and possess all powers and voting and other rights pertaining to the stock of the corporation and each share of Common Stock shall
be entitled to one vote. Except as otherwise provided by the DGCL or this Amended and Restated Certificate of Incorporation, the holders of record of Common Stock shall share ratably in all dividends payable in cash, stock or otherwise and other
distributions, whether in respect of liquidation or dissolution (voluntary or involuntary) or otherwise. The holders of the Common Stock shall have no preemptive rights to subscribe for any shares of any class of stock of this Corporation whether
now or hereafter authorized.
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| | B. | Voting. The holders of the Common Stock are entitled to one vote for each share of Common Stock held at all meetings of stockholders. There shall be no cumulative voting.
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| | C. | Number. The number of authorized shares of Common Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of
the holders of a majority of the stock of the Corporation entitled to vote, irrespective of the provisions of Section 242(b)(2) of the DGCL.
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| | D. | Dividends. Dividends may be declared and paid on the Common Stock from funds lawfully available therefor as and when determined by the Board of Directors and subject to any
preferential dividend rights of any then outstanding Preferred Stock.
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| | E. | Liquidation. Upon the dissolution or liquidation of the Corporation, whether voluntary or involuntary, holders of Common Stock will be entitled to receive all assets of the
Corporation available for distribution to its stockholders, subject to any preferential rights of any then outstanding Preferred Stock.
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| | 2. | Preferred Stock.
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Preferred Stock may be issued from time
to time in one or more series, each of such series to have such terms as stated or expressed herein and in the resolution or resolutions providing for the issue of such series adopted by the Board of Directors of the Corporation as hereinafter
provided. Any shares of Preferred Stock which may be redeemed, purchased or acquired by the Corporation may be reissued except as otherwise provided by law or this Amended and Restated Certificate of Incorporation. Different series of Preferred
Stock shall not be construed to constitute different classes of shares for the purposes of voting by classes unless expressly provided in the resolution or resolutions providing for the issue of such series adopted by the Board of Directors as
hereinafter provided.

Authority is hereby expressly granted to the Board of Directors from time to time to issue the Preferred Stock in
one or more series, and in connection with the creation of any such series, by resolution or resolutions providing for the issue of the shares thereof, to determine and fix



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such voting powers, full or limited, or no voting powers, and such designations, preferences and relative participating, optional or other special rights,
and qualifications, limitations or restrictions thereof, including without limitation thereof, dividend rights, conversion rights, redemption privileges and liquidation preferences, as shall be stated and expressed in such resolutions, all to the
full extent now or hereafter permitted by the DGCL. Without limiting the generality of the foregoing, the resolutions providing for issuance of any series of Preferred Stock may provide that such series shall be superior or rank equally or be junior
to the Preferred Stock of any other series to the extent permitted by law and this Amended and Restated Certificate of Incorporation. Except as otherwise provided in this Amended and Restated Certificate of Incorporation, no vote of the holders of
the Preferred Stock or Common Stock shall be a prerequisite to the designation or issuance of any shares of any series of the Preferred Stock authorized by and complying with the conditions of this Amended and Restated Certificate of Incorporation,
the right to have such vote being expressly waived by all present and future holders of the capital stock of the Corporation.

ARTICLE
V

The Corporation shall have a perpetual existence.

ARTICLE VI

In furtherance of and not in limitation of the powers conferred by statute, the
Board of Directors is expressly authorized to adopt, amend or repeal the By-Laws of this Corporation, subject to the right of the stockholders entitled to vote with respect thereto to alter and repeal the By-Laws adopted or amended by the Board of
Directors.

ARTICLE VII

Except to the extent that the DGCL prohibits the elimination or limitation of liability of directors for breaches of fiduciary duty, no director of the Corporation shall be personally liable to the Corporation or its stockholders for
monetary damages for any breach of fiduciary duty as a director, notwithstanding any provision of law imposing such liability. No amendment to or repeal of this provision shall apply to or have any effect on the liability or alleged liability of any
director of the Corporation for or with respect to any acts or omissions of such director occurring prior to such amendment.

ARTICLE
VIII



| | 1. | Indemnification. The Corporation shall, to the maximum extent permitted under the DGCL and except as set forth below, indemnify, hold harmless and, upon
request, advance expenses to each person (and the heirs, executors or administrators of such person) who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil,
criminal, administrative or investigative, by reason of the fact that he or she is or was, or has agreed to become, a director or officer of the Corporation, or is or was serving, or has agreed to serve, at the request of the Corporation, as a
director, officer or trustee of, or in a similar capacity with, another corporation, partnership, joint venture, trust or other enterprise, including any employee
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| | benefit plan (any such person being referred to hereafter as an Indemnitee), or by reason of any action alleged to have been taken or
omitted in such capacity, against all expenses (including attorneys fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by him or her or on his or her behalf in connection with such action, suit or
proceeding and any appeal therefrom, if he or she acted in good faith and in a manner he or she reasonably believed to be in, or not opposed to, the best interests of the Corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his or her conduct was unlawful. Notwithstanding anything to the contrary in this Article, the Corporation shall not indemnify an Indemnitee seeking indemnification in connection with any action, suit, proceeding, claim
or counterclaim, or part thereof, initiated by the Indemnitee unless the initiation thereof was approved by the Board of Directors of the Corporation.
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| | 2. | Advance of Expenses. Notwithstanding any other provisions, this Amended and Restated Certificate of Incorporation, the By-Laws of the Corporation, or any agreement, vote of
stockholder or disinterested directors, or arrangement to the contrary, the Corporation shall advance payment of expenses incurred by an Indemnitee in advance of the final disposition of any matter only upon receipt of an undertaking by or on behalf
of the Indemnitee to repay all amounts so advanced in the event that it shall ultimately be determined that the Indemnitee is not entitled to be indemnified by the Corporation as authorized in this Article. Such undertaking may be accepted without
reference to the financial ability of the Indemnitee to make such repayment.
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| | 3. | Subsequent Amendment. No amendment, termination or repeal of this Article or of the relevant provisions of the DGCL or any other applicable laws shall affect or diminish in
any way the rights of any Indemnitee to indemnification under the provisions hereof with respect to any action, suit, proceeding or investigation arising out of or relating to any actions, transactions or facts occurring prior to the final adoption
of such amendment, termination or repeal.
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| | 4. | Other Rights. The Corporation may, to the extent authorized from time to time by its Board of Directors, grant indemnification rights to other employees or agents of the
Corporation or other persons serving the Corporation and such rights may be equivalent to, or greater or less than, those set forth in this Article.
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| | 5. | Reliance. Persons who after the date of the adoption of this provision become or remain directors or officers of the Corporation or who, while a director or officer of the
Corporation, become or remain a director, officer, employee or agent of a subsidiary, shall be conclusively presumed to have relied on the rights to indemnity, advance of expenses and other rights contained in this Article in entering into or
continuing such service. The rights to indemnification and to the advance of expenses conferred in this Article shall apply to claims made against an indemnitee arising out of acts or omissions which occurred or occur both prior and subsequent to
the adoption hereof.
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| | 6. | Merger or Consolidation. If the Corporation is merged into or consolidated with another corporation and the Corporation is not the surviving corporation, the surviving
corporation shall assume the obligations of the Corporation under this Article with respect to any action, suit, proceeding or investigation arising out of or relating to any actions, transactions or facts occurring prior to the date of such merger
or consolidation.
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| | 7. | Insurance. The Corporation shall have power to purchase and maintain insurance on behalf of any person who is or was, or has agreed to become, a director, officer, employee
or agent of the Corporation, or is or was serving, or has agreed to serve, at the request of the Corporation as a director, officer, employee, agent or trustee of another corporation, partnership, joint venture, trust or other enterprise, including
any employee benefit plan, against all expenses (including attorneys fees) judgments, fines or amounts paid in settlement incurred by such person in any such capacity or arising out of his or her status as such, whether or not the Corporation
would have the power to indemnify him or her against such expenses under the DGCL.
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| | 8. | Savings Clause. If this Article or any portion hereof shall be invalidated on any ground by any court of competent jurisdiction, then the Corporation shall nevertheless
indemnify each Indemnitee as to any expenses, including attorneys fees, judgments, fines and amounts paid in settlement in connection with any action, suit, proceeding or investigation, whether civil, criminal or administrative, including an
action by or in the right of the Corporation, to the fullest extent permitted by any applicable portion of this Article that shall not have been invalidated and to the fullest extent permitted by applicable law.
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ARTICLE IX

The Corporation
reserves the right to amend, alter, change or repeal any provision contained in this Amended and Restated Certificate of Incorporation, in the manner now or hereafter prescribed by statute and this Amended and Restated Certificate of Incorporation,
and all rights conferred upon stockholders herein are granted subject to this reservation.

ARTICLE X

This Article is inserted for the management of the business and for the conduct of the affairs of the Corporation.



| | 1. | Number of Directors. The number of directors of the Corporation shall not be less than three. The exact number of directors within the limitations specified in the preceding
sentence shall be fixed from time to time by, or in the manner provided in, the By-Laws of the Corporation.
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| | 2. | Classes of Directors. The Board of Directors shall be and is divided into three classes: Class I, Class II and Class III. No one class shall have more than
one director more than any other class. If a fraction is contained in the quotient arrived at by dividing the designated number of directors by three, then, if such fraction is
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| | one-third, the extra director shall be a member of Class III, and if such fraction is two-thirds, one of the extra directors shall be a member of Class III
and one of the extra directors shall be a member of Class II, unless otherwise provided from time to time by resolution adopted by the Board of Directors.
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| | 3. | Election of Directors. Elections of directors need not be by written ballot except as and to the extent provided in the By-Laws of the Corporation.
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| | 4. | Terms of Office. Except as provided in Section 6 of this Article X, each director shall serve for a term ending on the date of the third annual meeting following the
annual meeting at which such director was elected; provided, however, that each initial director in Class I shall serve for a term ending on the date of the annual meeting in 2001; each initial director in Class II shall serve for a
term ending on the date of the annual meeting in 2002; and each initial director in Class III shall serve for a term ending on the date of the annual meeting in 2003; and provided, further, that the term of each director shall be subject to the
election and qualification of his or her successor and to his or her earlier death, resignation or removal.
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| | 5. | Allocation of Directors Among Classes in the Event of Increases or Decreases in the Number of Directors. In the event of any increase or decrease in the authorized number of
directors, (i) each director then serving as such shall nevertheless continue as a director of the class of which he or she is a member and (ii) the newly created or eliminated directorships resulting from such increase or decrease shall
be apportioned by the Board of Directors among the three classes of directors so as to ensure that no one class has more than one director more than any other class. To the extent possible, consistent with the foregoing rule, any newly created
directorships shall be added to those classes whose terms of office are to expire at the latest dates following such allocation, and any newly eliminated directorships shall be subtracted from those classes whose terms of offices are to expire at
the earliest dates following such allocation, unless otherwise provided from time to time by resolution adopted by the Board of Directors.
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| | 6. | Removal. The directors of the Corporation may not be removed without cause and may be removed for cause only by the affirmative vote of the holders of at least seventy-five
percent (75%) of the shares of the capital stock of the Corporation issued and outstanding and entitled to vote generally in the election of directors cast at a meeting of the stockholders called for that purpose, notwithstanding the fact that
a lesser percentage may be specified by law.
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| | 7. | Vacancies. Any vacancy in the Board of Directors, however occurring, including a vacancy resulting from an enlargement of the Board, shall be filled only by
vote of a majority of the directors then in office, although less than a quorum, or by a sole remaining director. A director elected to fill a vacancy shall be elected for the unexpired term of his or her predecessor in office, and a director chosen
to fill a position resulting from an increase in the number of directors shall hold office
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| | until the next election of the class for which such director shall have been chosen, subject to the election and qualification of his or her successor and to
his or her earlier death, resignation or removal.
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| | 8. | Stockholder Nominations and Introduction of Business, Etc. Advance notice of stockholder nominations for election of directors and other business to be brought by
stockholders before either an annual or special meeting of stockholders shall be given in the manner provided by the By-Laws of this Corporation.
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ARTICLE XI



| | 1. | Dividends. The Board of Directors shall have authority from time to time to set apart out of any assets of the Corporation otherwise available for dividends a reserve or
reserves as working capital or for any other purpose or purposes, and to abolish or add to any such reserve or reserves from time to time as said board may deem to be in the interest of the Corporation; and said Board shall likewise have power to
determine in its discretion, except as herein otherwise provided, what part of the assets of the Corporation available for dividends in excess of such reserve or reserves shall be declared in dividends and paid to the stockholders of the
Corporation.
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| | 2. | Issuance of Stock. The shares of all classes of stock of the Corporation may be issued by the Corporation from time to time for such consideration as from time to time may be
fixed by the Board of Directors of the Corporation, provided that shares of stock having a par value shall not be issued for a consideration less than such par value, as determined by the Board. At any time, or from time to time, the Corporation may
grant rights or options to purchase from the Corporation any shares of its stock of any class or classes to run for such period of time, for such consideration, upon such terms and conditions, and in such form as the Board of Directors may
determine. The Board of Directors shall have authority, as provided by law, to determine that only a part of the consideration which shall be received by the Corporation for the shares of its stock which it shall issue from time to time, shall be
capital; provided, however, that, if all the shares issued shall be shares having a par value, the amount of the part of such consideration so determined to be capital shall be equal to the aggregate par value of such shares. The excess, if any, at
any time, of the total net assets of the Corporation over the amount so determined to be capital, as aforesaid, shall be surplus. All classes of stock of the Corporation shall be and remain at all times nonassessable.
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The Board of Directors is hereby expressly authorized, in its discretion, in connection with the issuance of any obligations or stock of the Corporation
(but without intending hereby to limit its general power so to do in other cases), to grant rights or options to purchase stock of the Corporation of any class upon such terms and during such period as the Board of Directors shall determine, and to
cause such rights to be evidenced by such warrants or other instruments as it may deem advisable.



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| | 3. | Inspection of Books and Records. The Board of Directors shall have power from time to time to determine to what extent and at what times and places and under what conditions
and regulations the accounts and books of the Corporation, or any of them, shall be open to the inspection of the stockholders; and no stockholder shall have any right to inspect any account or book or document of the Corporation, except as
conferred by the laws of the State of Delaware, unless and until authorized so to do by resolution of the Board of Directors or of the stockholders of the Corporation.
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| | 4. | Location of Meetings, Books and Records. Except as otherwise provided in the By-laws, the stockholders of the Corporation and the Board of Directors may hold their meetings
and have an office or offices outside of the State of Delaware and, subject to the provisions of the laws of said State, may keep the books of the Corporation outside of said State at such places as may, from time to time, be designated by the Board
of Directors or by the By-laws of this Corporation.
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ARTICLE XII

At any time during which a class of capital stock of this Corporation is registered under Section 12 of the Securities Exchange Act of 1934 or any
similar successor statute, stockholders of the Corporation may not take any action by written consent in lieu of a meeting.

ARTICLE
XIII

Special meetings of stockholders may be called at any time by only the Chairman of the Board of Directors, the Chief
Executive Officer (or if there is no Chief Executive Officer, the President), or by the Board of Directors of the Corporation pursuant to a resolution adopted by the affirmative vote of a majority of the total number of directors then in office. Any
business transacted at any special meeting of stockholders shall be limited to matters relating to the purpose or purposes stated in the notice of meeting.

ARTICLE XIV

The Board of Directors of this Corporation, when evaluating any offer of another
party to make a tender or exchange offer for any equity security of the Corporation, shall, in connection with the exercise of its judgment in determining what is in the best interests of the Corporation as a whole, be authorized to give due
consideration to any such factors as the Board of Directors determines to be relevant, including without limitation: (i) the interests of the stockholders of the Corporation; (ii) whether the proposed transaction might violate federal or
state laws; (iii) not only the consideration being offered in the proposed transaction, in relation of the then current market price for the outstanding capital stock of the Corporation, but also to the market price for the capital stock of the
Corporation over a period of years, the estimated price that might be achieved in a negotiated sale of the Corporation as a whole or in part or through orderly liquidation, the premiums over market price for the securities of other corporations in
similar transactions, current political, economic and other factors bearing on securities prices and the



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Corporations financial condition and future prospects; and (iv) the social, legal and economic effects upon employees, suppliers, customers and
others having similar relationships with the Corporation, and the communities in which the Corporation conducts its business.

In
connection with any such evaluation, the Board of Directors is authorized to conduct such investigations and to engage in such legal proceedings as the Board of Directors may determine.

ARTICLE XV

The Corporation expressly elects to be governed by
Section 203 of the DGCL.

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IN WITNESS HEREOF, said SMTC Corporation has
caused this Amended and Restated Certificate of Incorporation to be executed by John Caldwell, its President, this 29thday of August, 2008.



SMTC CORPORATION/s/ John CaldwellName:

John CaldwellTitle:

President




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