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                                                                   EXHIBIT 10.12

     CONFIDENTIAL MATERIALS OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND
     EXCHANGE COMMISSION. THE LOCATIONS OF THE OMITTED MATERIALS ARE INDICATED
     BY THE FOLLOWING NOTATION: [***]

                          TECHNOLOGY TRANSFER AGREEMENT

THIS TECHNOLOGY TRANSFER AGREEMENT ("Agreement") is made as of November 30,
2002, between Allegro MicroSystems, Inc., a Delaware corporation with its
principal offices at 115 Northeast Cutoff, Worcester, Massachusetts 01615
("Allegro"); and Sanken Electric Co., Ltd., a Japanese corporation with its
principal offices at 3-6-3 Niiza-shi, Saitama, Japan ("Sanken").

WHEREAS, Allegro provided Sanken access to certain technology developed by
Allegro for the purpose of assisting Sanken in the development of SBCD3
technology, and Sanken provided Allegro access to certain technology developed
by Sanken for the purpose of assisting Allegro in the development of ABCD3
technology, and the parties now wish to provide for payment in consideration of
access to the technology that the parties have granted each other pursuant to
the terms and conditions of this Agreement.

NOW, THEREFORE, the parties hereby agree as follows:

1.   Background History.

In July of 1997, Allegro and its parent company, Sanken, were in the process of
developing similar technologies as part of their product development efforts.
These technologies were to be derived from [***] BCD technology for applications
in the automotive and office automation industries. Pursuant to a management
decision, Allegro and Sanken shared information and cooperated in planning the
development of the new technologies. The parties ultimately decided to build the
new technologies from the starting point of certain technology developed by
Allegro and Sanken prior

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to July of 1997. Thereafter, development proceeded along two separate paths as
each party intended to have different applications specific to their market. In
the case of Allegro, the new technology was known as ABCD3 and was intended for
[***] capability, whereas Sanken's new technology was known as SBCD3 and was
intended for [***] capability.

After July of 1997, Allegro and Sanken coordinated their research and
development activities. Their relevant new technologies of ABCD3 and SBCD3 were
developed by cross-exploitation of each party's know-how, information, and
assistance; however, the parties separately paid for their respective
development costs. It was ultimately determined, by way of an independent
valuation, that at the time of such technology exchange the value of Allegro's
technology was approximately $[***] and the value of Sanken's technology was
approximately $[***]. As a result, it was agreed that Sanken would recognize
receipt of a net benefit of $[***] to be compensated to Allegro.

The parties now wish to memorialize their understanding concerning this matter,
and provide for a transfer of the applicable technology in exchange for a
monetary payment.

2.   Transfer of Technology.

It is hereby confirmed that, effective as of July of 1997, Allegro conveyed to
Sanken, and Sanken conveyed to Allegro, a permanent, worldwide, nonexclusive,
royalty-free license to utilize the "Technology" as defined below, without
restriction as to the use or transferability of the Technology. In conformance
with standard commercial practice, unrestricted use and transferability shall
mean that either party may use or transfer the technology providing that,
consistent with traditional commercial practice, such use or transfer is not for
or to a competitor of either party.

For purposes of this Agreement, the term "Technology" means the know-how and
expertise of Allegro/Sanken with respect to in-process BCD technology that was
made available to, or utilized by, Sanken/Allegro in the development efforts
that are the subject of this Agreement, including any concepts, designs,
drawings, specifications, formulations or other technical information inherent
therein.

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3.   Payment for Transfer.

In exchange for the conveyance of the Technology, Sanken agrees pay Allegro the
amount of $[***], calculated as the sum of the following:

(a)  The Technology value of $[***] as of July of 1997 as stipulated in Section
     1 of this Agreement.

(b)  Interest from August 1, 1997 through November 30, 2002, compounded annually
     at a rate of [***]%, [***], which rate is equal to the [***] commencing
     August 1, 1997.

In the event that payment is made after November 30, 2002, Allegro shall be
entitled to additional interest of [***]% per annum on the payment amount
described above from December 1, 2002 until the date of payment.

4.   Disclaimer of Warranty.

The Technology conveyed pursuant to this Agreement was made available by each
party on an "as is" basis. Sanken and Allegro each acknowledge that neither
party makes any warranty regarding the Technology.

5.   Ownership of Subsequent Technologies.

Allegro and Sanken shall independently own any advancements or improvements of
ABCD3 or SBCD3 technology that they may respectively develop, as well as any new
technologies based on ABCD3 that Allegro may develop or any new technologies
based on SBCD3 that Sanken may develop. Notwithstanding the foregoing, in the
event that either party desires to utilize technology owned by the other party
(other than the Technology licensed hereunder), the parties shall cooperate to
determine the appropriate terms of a technology license and royalty arrangement.

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6.   Further Actions.

The parties agree to cooperate and take such further actions as may be
reasonably necessary in order to effectuate the intent of this Agreement,
including execution of documents to convey the Technology.

7.   Language.

This Agreement was drafted and executed in English. Any translation into
Japanese or another language shall not impact the interpretation of this
Agreement.

8.   Choice of Law.

This Agreement shall be construed in accordance with Massachusetts law.

9.   Entire Agreement; Amendment.

This Agreement constitutes the entire understanding between the parties with
respect to the subject matter hereof and supersedes any prior agreements or
communications. This Agreement may be amended only by a written document signed
by an authorized representative of each party.

IN WITNESS WHEREOF, the parties hereto have caused this Technology Transfer
Agreement to be executed as of the date set forth in the first paragraph hereof.

ALLEGRO MICROSYSTEMS, INC.              SANKEN ELECTRIC CO., LTD.

/s/ Dennis Fitzgerald                   /s/ Hirohito Sekine
-------------------------------------   ----------------------------------------
Dennis Fitzgerald                       Hirohito Sekine
President                               Senior Managing Director

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                                                                   EXHIBIT 10.23

     CONFIDENTIAL MATERIALS OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND
     EXCHANGE COMMISSION. THE LOCATIONS OF THE OMITTED MATERIALS ARE INDICATED
     BY THE FOLLOWING NOTATION: [***].

                                   Agreement

Sharp Corporation, with its head office located at 22-22 Nagaike-cho, Abeno-ku,
Osaka-shi, Osaka-fu, Japan (hereinafter "Sharp");

Sanken Electric Co., Ltd., with its head office located at 6-3, Kitano 3-chome,
Niiza-shi, Saitama-ken, Japan (hereinafter "Sanken"); and

Allegro MicroSystems, Inc., with its head office located at 115 Northeast
Cutoff, Worcester, Massachusetts 01606, U.S.A. (hereinafter "Allegro") have
concluded this Agreement as follows, as of December 28, 2006.

                                   WITNESSETH

Sharp is the right holder of the Japan registered trademark No. 2155108
"ALLEGRO" (hereinafter, the "Trademark").

Sharp and Sanken have entered into an agreement dated October 1, 1991, and a
memorandum dated October 31, 2001 on Sanken's undertaking of a license for the
use of the Trademark.

Sanken and Allegro desire to obtain the right to use the Trademark on
semiconductors (hereinafter, the "Products") within Japan.

In addition, Allegro desires to legalize the Japanese registered trademark
application No. 2004-83807 "Allegro MicroSystems Inc." (hereinafter, the
"Pending Trademark").

Sharp agrees to grant the right to use the Trademark and the Pending Trademark
on the Products within Japan to Sanken and Allegro.

Accordingly, each of the parties hereby agrees as follows.

Article 1. (Definitions)

     1.   "Trademark" means the following

          Japan registered trademark No. 2155108 "ALLEGRO"

     2.   "Pending Trademark" means the following

          Japanese registered trademark application No. 2004-83807 "Allegro
          MicroSystems Inc."

     3.   "Products" means "semiconductors".

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Article 2. (License)

     1.  Sharp shall grant to Sanken and Allegro an ordinary use license with
         regard to the Products out of the specified products of the Trademark,
         within Japan.

     2.  As a condition of the receipt of the license to the Trademark based on
         the above Paragraph, Allegro shall consent to the changing of the
         applicants name for the Pending Trademark applied for by Allegro to
         Sharp; provided however, that Allegro shall bear the processing costs
         with regard to the interim procedures and registration fees until the
         name change and legalization, and Sharp shall cooperate with such
         procedures.

     3.  Sharp shall not make any assertion of its rights based on the
         Trademark with regard to Sanken and Allegro's use of the Pending
         Trademark on the Products.

     4.  When the Pending Trademark with the applicant name changed to Sharp
         has become legalized based on Paragraph 2 of this Article, Sharp shall
         grant an ordinary use license to Sanken and Allegro for the use of the
         Pending Trademark on the Products, within Japan.

     5.  Sanken and Allegro may, at their own expense, register the
         establishment of the licenses in Paragraph 1 and Paragraph 4, and Sharp
         shall cooperate with the same.

     6.  Sharp agrees that [***].

     7.  Sharp agrees that after the Pending Trademark with the applicant name
         changed to Sharp has become legalized based on Paragraph 2 of this
         Article, [***].

Article 3. (Consideration)

     1.  As consideration for this Agreement, Sanken shall pay a lump sum of
         [***] after conclusion of this Agreement.

     2.  Sharp shall not return the consideration paid by Sanken for any
         reason.

     3.  Conditional upon the payment of the consideration in Paragraph 1 of
         this Article, Sharp shall not assert any rights with regard to Sanken
         or Allegro's use of the Pending Trademark on the Products.

Article 4. (Provision of Documents)

If Sanken or Allegro is requested by Sharp, they agree to send to Sharp
documents such as catalogues, etc. that show their use of the Trademark or the
Pending Trademark in accordance with Article 2.

Article 5. (No Warranty)

     1.  Sharp shall not bear any obligation to Sanken or Allegro, nor does it
         make any warranty, to maintain the trademark rights or eliminate
         infringements by third parties with regard to the Trademark (including
         the "Pending Trademark" where it has been legalized based on Article 2
         Paragraph 4. The same to apply in the following Paragraphs).

     2.  If the Trademark is infringed by a third party, and Sharp is requested
         for cooperation by Sanken or Allegro, if Sharp decides that some kind
         of action is necessary and desirable, it may take necessary actions, at
         the cost of Sanken or Allegro, within the

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          scope desired by Sanken or Allegro, and based on agreement between
          Sharp, Sanken and Allegro.

     3.   If Sanken or Allegro makes an appeal for cancellation due to lack of
          use, or other application, demand or claim to the disadvantage of
          Sharp against the Trademark, the Pending Trademark or any similar
          trademark, Sharp may terminate this Agreement.

Article 6. (Assignment)

[***]

Article 7. (Term)

     1.   The term of this Agreement shall be for 10 years from October 1, 2006;
          provided however, that the agreement term may be extended on
          conditions to be separately discussed if, by 6 months prior to the
          expiry of the term, Sanken proposes to extend the agreement.

     2.   This Agreement shall replace the Agreement dated October 1, 1991 and
          the Memorandum dated October 31, 2001 between Sharp and Sanken.

Article 8. (Consultation)

If any doubts arise regarding matters for which there is no provision in this
Agreement or regarding the interpretation hereof, Sharp, Sanken and Allegro
shall consult and resolve them in good faith.

Article 9. (Dispute Resolution)

Where a dispute that has arisen with regard to this Agreement cannot be resolved
in accordance with Article 8, it shall be resolved by a court. In this case, the
Osaka District Court shall be the court with jurisdiction in the first instance.

Article 10. (Governing Law)

The governing law of this Agreement shall be Japanese law.

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In witness whereof, this Agreement has been prepared in three parts, and Sharp,
Sanken and Allegro shall each retain one part.

December 28, 2006

Sharp:   22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka-fu
         Sharp Corporation
         Intellectual Property Headquarters
         General Manager
         Shigeo Terajima
         [seal affixed]

Sanken:  6-3, Kitano 3-chome, Niiza-shi, Saitama-ken
         Sanken Electric Co., Ltd.
         Director, Executive Vice President
         General Manager of Engineering Headquarters
         Hirohito Sekine
         [seal affixed]

Allegro: 115 Northeast Cutoff, Worcester, Massachusetts 01606
         Allegro MicroSystems, Inc.
         Vice President and General Counsel
         Fred Windover

         /s/ Fred Windover

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