Exhibit 10.4.12

March 28, 2007



|                                                |  |                                            
|----------------------------------------------- |  | -------------------------------------------
|SMTC Manufacturing Corporation of California    |  | SMTP Manufacturing Corporation of Wisconsin
|2302 Trade Zone Boulevard                       |  | 2222 E. Pensar Drive                       
|San Jose, California                            |  | Appleton, Wisconsin                        
|USA                                             |  | USA                                        
|95131                                           |  |                                            
|                                                | 
|- and -                                         |  | - and                                     
|                                                | 
|SMTC Manufacturing Corporation of Massachusetts |  | SMTC Mex Holdings, Inc.                    
|109 Constitution Blvd.                          |  | 635 Hood Road                              
|Unit 160                                        |  | Markham Ontario                            
|Franklin, Massachusetts                         |  | Canada                                     
|USA                                             |  | L3R 4N6                                    

Attention: Jane Todd

Dear Sirs/Mesdames:



| | Re: | Wachovia Capital Corporation (Central) and SMTC Manufacturing Corporation of California, SMTC Manufacturing Corporation of Wisconsin, SMTC Manufacturing Corporation of
Massachusetts and SMTC Mex Holdings, Inc.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Reference is made to a Loan Agreement dated as of June 1, 2004 as
amended March 10, 2005, August 17, 2005, June 12, 2006, August 1, 2006 and September 20, 2006 (the Loan Agreement) between SMTC Manufacturing Corporation of California, SMTC Manufacturing
Corporation of Wisconsin, SMTC Manufacturing Corporation of Massachusetts and SMTC Mex Holdings, Inc., as borrowers (Borrowers), and Congress Financial Corporation (Central), now known as Wachovia Capital Finance Corporation
(Central), as lender (Lender). All capitalized terms used in this notice of extension but not defined herein have the meanings given to such terms in the Loan Agreement.

Borrowers are hereby given notice that Lender has agreed to extend the Renewal Date of the Loan Agreement to April 15, 2008. All other terms and
conditions of the Loan Agreement remain in full force and effect, unamended. Borrowers agree to pay to Lender an early termination fee equal to 0.50% of the US Maximum Credit if the Loan Agreement is terminated prior to October 15, 2007.



Yours very truly,WACHOVIA CAPITAL FINANCE CORPORATION (CENTRAL)By:

/s/ Darrell KayName:

Darrell KayTitle:

Vice President




---

The undersigned Borrowers hereby acknowledge receipt of the foregoing notice of extension of the Loan Agreement and agree
to same.

Dated this 28thday of March, 2007.



|                                                |  |                   |  |                                             |  |        |  |                  
|----------------------------------------------- |  | ----------------- |  | ------------------------------------------- |  | ------ |  | -----------------
|SMTC MANUFACTURING CORPORATION OF
CALIFORNIA    |  |                   |  | SMTC MANUFACTURING CORPORATION
OF WISCONSIN
|                                                |  |                   |  |                                            
|By:                                             |  | /s/ Jane Todd     |  |                                             |  | By:    |  | /s/ Jane Todd    
|Name:                                           |  | Jane Todd         |  |                                             |  | Name:  |  | Jane Todd        
|Title:                                          |  | SVP Finance & CFO |  |                                             |  | Title: |  | SVP Finance & CFO
|                                                |  |                  
|SMTC MANUFACTURING CORPORATION OF
MASSACHUSETTS |  |                   |  | SMTC MEX HOLDINGS, INC.                    
|                                                |  |                   |  |                                            
|By:                                             |  | /s/ Jane Todd     |  |                                             |  | By:    |  | /s/ Jane Todd    
|Name:                                           |  | Jane Todd         |  |                                             |  | Name:  |  | Jane Todd        
|Title:                                          |  | SVP Finance & CFO |  |                                             |  | Title: |  | SVP Finance & CFO

[Intentionally Left Blank]



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---

Echo f the undersigned Obligors hereby:



| | (a) | acknowledges, confirms and agrees that such Obligors Financing Agreements (as each of the same may have been amended, modified, supplemented, extended, renewed, restated or
replaced) remain in full force and effect as at the date hereof in respect of each of the Borrowers Obligations under the Loan Agreement, as renewed/extended as herein provided; and
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (b) | acknowledges and confirms that such Obligor has received a copy of the Loan Agreement and this notice of extension and understands the terms thereof.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------

Dated this 28thday of March, 2007.



|                                |  |                   |  |                                                  |  |        |  |                  
|------------------------------- |  | ----------------- |  | ------------------------------------------------ |  | ------ |  | -----------------
|SMTC CORPORATION                |  |                   |  | SMTC MANUFACTURING CORPORATION
OF NORTH CAROLINA
|                                |  |                   |  |                                                 
|By:                             |  | /s/ Jane Todd     |  |                                                  |  | By:    |  | /s/ Jane Todd    
|Name:                           |  | Jane Todd         |  |                                                  |  | Name:  |  | Jane Todd        
|Title:                          |  | SVP Finance & CFO |  |                                                  |  | Title: |  | SVP Finance & CFO
|                                |  |                  
|HTM HOLDINGS, INC.              |  |                   |  | RADIO COMPONENTES DE MEXICO, S.A. DE C.V.       
|                                |  |                   |  |                                                 
|By:                             |  | /s/ Jane Todd     |  |                                                  |  | By:    |  | /s/ Jane Todd    
|Name:                           |  | Jane Todd         |  |                                                  |  | Name:  |  | Jane Todd        
|Title:                          |  | SVP Finance & CFO |  |                                                  |  | Title: |  | SVP Finance & CFO
|                                |  |                   | 
|SMTC DE CHIHUAHUA, S.A. DE C.V. |  |                   |  |                                                  |  |       
|                                |  |                   |  |                                                 
|By:                             |  | /s/ Jane Todd     |  |                                                  |  |        |  |                  
|Name:                           |  | Jane Todd         |  |                                                  |  |        |  |                  
|Title:                          |  | SVP Finance & CFO |  |                                                  |  |        |  |                  



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