Exhibit 12.1

Freescale Semiconductor Holdings I, Ltd. and Subsidiaries

Computation of Ratio of Earnings to Fixed Charges

(in millions)



|                                       |  |                            |       |                               |   |        |                               |  |   |                                      |   |  |   |        |                                 |  |                            |  |   |     |  |   |    
|-------------------------------------- |  | -------------------------- | ----- | ----------------------------- | - | ------ | ----------------------------- |  | - | ------------------------------------ | - |  | - | ------ | ------------------------------- |  | -------------------------- |  | - | --- |  | - | ---
|                                       |  | Successor                  |       |                               |   |        | Predecessor                  
|                                       |  | Year EndedDecember 31,2009 |       | Year EndedDecember 31,2008(3) |   |        | Year EndedDecember 31,2007(3) |  |   | December 2throughDecember 31,2006(3) |   |  |   |        | January 1throughDecember 1,2006 |  | Year EndedDecember 31,2005
|Earnings:                              |  |                            |       |                               |   |        |                               |  |   |                                      |   |  |   |        |                                 |  |                            |  |   |     |  |   |    
|Earnings (loss) before income taxes(1) |  | $                          | 507   |                               | $ | (8,477 | )                             |  | $ | (2,499                               | ) |  | $ | (2,521 | )                               |  |                            |  | $ | 420 |  | $ | 624
|Less: Capitalized interest             |  |                            |      |                               |   |       |                               |  |   |                                     |   |  |   |       |                                 |  |                            |  |   |    |  |   |   
|Add: Fixed charges (per below)         |  |                            | 576   |                               |   | 744    |                               |  |   | 846                                  |   |  |   | 72     |                                 |  |                            |  |   | 92  |  |   | 104
|                                       |  |                            |       |                               |   |        |                               |  |   |                                      |   |  |   |        |                                 |  |                            |  |   |     |  |   |    
|Total earnings (loss)(2)               |  | $                          | 1,083 |                               | $ | (7,733 | )                             |  | $ | (1,653                               | ) |  | $ | (2,449 | )                               |  |                            |  | $ | 512 |  | $ | 728
|                                       |  |                            |       |                               |   |        |                               |  |   |                                      |   |  |   |        |                                 |  |                            |  |   |     |  |   |    
|Fixed charges:                         |  |                            |       |                               |   |        |                               |  |   |                                      |   |  |   |        |                                 |  |                            |  |   |     |  |   |    
|Interest expense                       |  | $                          | 571   |                               | $ | 738    |                               |  | $ | 834                                  |   |  | $ | 71     |                                 |  |                            |  | $ | 78  |  | $ | 85 
|Rent expense interest factor           |  |                            | 5     |                               |   | 6      |                               |  |   | 12                                   |   |  |   | 1      |                                 |  |                            |  |   | 14  |  |   | 19 
|                                       |  |                            |       |                               |   |        |                               |  |   |                                      |   |  |   |        |                                 |  |                            |  |   |     |  |   |    
|Total fixed charges                    |  | $                          | 576   |                               | $ | 744    |                               |  | $ | 846                                  |   |  | $ | 72     |                                 |  |                            |  | $ | 92  |  | $ | 104
|                                       |  |                            |       |                               |   |        |                               |  |   |                                      |   |  |   |        |                                 |  |                            |  |   |     |  |   |    
|Ratio of earnings to fixed charges     |  |                            | 1.9   |                               |   |       |                               |  |   |                                     |   |  |   |       |                                 |  |                            |  |   | 5.6 |  |   | 7.0
|                                       |  |                            |       |                               |   |        |                               |  |   |                                      |   |  |   |        |                                 |  |                            |  |   |     |  |   |    



|(1) | After adjustments required by Item 503(d) of SEC Regulation S-K, earnings or loss of equity investees.
|--- | ------------------------------------------------------------------------------------------------------

|(2) | As defined in Item 503(d) of SEC Regulation S-K.
|--- | ------------------------------------------------

|(3) | Earnings were inadequate to cover fixed charges for the year ended December 31, 2008 and 2007 and the period from December 2, 2006 through December 31, 2006 by $8.5
billion, $2.5 billion and $2.5 billion, respectively.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------