Exhibit 12.1

Freescale Semiconductor Holdings I, Ltd. and Subsidiaries

Computation of
Ratio of Earnings to Fixed Charges

(in millions)



|                                       |  |                               |        |   |                            |   |             |                               |  |   |                               |   |  |                                      |        |   |  |   |                                 |   |  |  |  |   |     | 
|-------------------------------------- |  | ----------------------------- | ------ | - | -------------------------- | - | ----------- | ----------------------------- |  | - | ----------------------------- | - |  | ------------------------------------ | ------ | - |  | - | ------------------------------- | - |  |  |  | - | --- | 
|                                       |  | Successor                     |        |   |                            |   | Predecessor |                              
|                                       |  | Year
EndedDecember 31,2010(3) |        |   | Year EndedDecember 31,2009 |   |             | Year
EndedDecember 31,2008(3) |  |   | Year
EndedDecember 31,2007(3) |   |  | December 2throughDecember 31,2006(3) |        |   |  |   | January 1throughDecember 1,2006 |  
|Earnings:                              |  |                               |        |   |                            |   |             |                               |  |   |                               |   |  |                                      |        |   |  |   |                                 |   |  |  |  |   |     | 
|Earnings (loss) before income taxes(1) |  | $                             | (1,075 | ) |                            | $ | 507         |                               |  | $ | (8,477                        | ) |  | $                                    | (2,499 | ) |  | $ | (2,521                          | ) |  |  |  | $ | 420 | 
|Less: Capitalized interest             |  |                               |       |   |                            |   |            |                               |  |   |                              |   |  |                                      |       |   |  |   |                                |   |  |  |  |   |    | 
|Add: Fixed charges (per below)         |  |                               | 601    |   |                            |   | 582         |                               |  |   | 744                           |   |  |                                      | 846    |   |  |   | 72                              |   |  |  |  |   | 92  | 
|                                       |  |                               |        |   |                            |   |             |                               |  |   |                               |   |  |                                      |        |   |  |   |                                 |   |  |  |  |   |     | 
|Total earnings (loss)(2)               |  | $                             | (474   | ) |                            | $ | 1,089       |                               |  | $ | (7,733                        | ) |  | $                                    | (1,653 | ) |  | $ | (2,449                          | ) |  |  |  | $ | 512 | 
|                                       |  |                               |        |   |                            |   |             |                               |  |   |                               |   |  |                                      |        |   |  |   |                                 |   |  |  |  |   |     | 
|Fixed charges:                         |  |                               |        |   |                            |   |             |                               |  |   |                               |   |  |                                      |        |   |  |   |                                 |   |  |  |  |   |     | 
|Interest expense                       |  | $                             | 591    |   |                            | $ | 571         |                               |  | $ | 738                           |   |  | $                                    | 834    |   |  | $ | 71                              |   |  |  |  | $ | 78  | 
|Rent expense interest factor           |  |                               | 10     |   |                            |   | 11          |                               |  |   | 6                             |   |  |                                      | 12     |   |  |   | 1                               |   |  |  |  |   | 14  | 
|                                       |  |                               |        |   |                            |   |             |                               |  |   |                               |   |  |                                      |        |   |  |   |                                 |   |  |  |  |   |     | 
|Total fixed charges                    |  | $                             | 601    |   |                            | $ | 582         |                               |  | $ | 744                           |   |  | $                                    | 846    |   |  | $ | 72                              |   |  |  |  | $ | 92  | 
|                                       |  |                               |        |   |                            |   |             |                               |  |   |                               |   |  |                                      |        |   |  |   |                                 |   |  |  |  |   |     | 
|Ratio of earnings to fixed charges     |  |                               |       |   |                            |   | 1.9         |                               |  |   |                              |   |  |                                      |       |   |  |   |                                |   |  |  |  |   | 5.6 | 
|                                       |  |                               |        |   |                            |   |             |                               |  |   |                               |   |  |                                      |        |   |  |   |                                 |   |  |  |  |   |     | 



|(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, 2010, 2008 and 2007 and the period from December 2, 2006 through
December 31, 2006 by $1.1 billion, $8.5 billion, $2.5 billion and $2.5 billion, respectively.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------