Exhibit 12.1

Freescale Semiconductor Holdings I, Ltd. and Subsidiaries

Computation of Ratio of Earnings to
Fixed Charges

(in millions)



|                                       |  |                               |        |   |                               |   |             |                                      |  |   |        |   |                                 |  |                            |   |                            |  |   |     |  |   |    
|-------------------------------------- |  | ----------------------------- | ------ | - | ----------------------------- | - | ----------- | ------------------------------------ |  | - | ------ | - | ------------------------------- |  | -------------------------- | - | -------------------------- |  | - | --- |  | - | ---
|                                       |  | Successor                     |        |   |                               |   | Predecessor
|                                       |  | Year EndedDecember 31,2008(3) |        |   | Year EndedDecember 31,2007(3) |   |             | December 2throughDecember 31,2006(3) |  |   |        |   | January 1throughDecember 1,2006 |  | Year EndedDecember 31,2005 |   | Year EndedDecember 31,2004
|Earnings:                              |  |                               |        |   |                               |   |             |                                      |  |   |        |   |                                 |  |                            |   |                            |  |   |     |  |   |    
|Earnings (loss) before income taxes(1) |  | $                             | (8,477 | ) |                               | $ | (2,499      | )                                    |  | $ | (2,521 | ) |                                 |  |                            | $ | 420                        |  | $ | 624 |  | $ | 266
|Less: Capitalized interest             |  |                               |       |   |                               |   |            |                                      |  |   |       |   |                                 |  |                            |   |                           |  |   |    |  |   |   
|Add: Fixed charges (per below)         |  |                               | 665    |   |                               |   | 846         |                                      |  |   | 72     |   |                                 |  |                            |   | 107                        |  |   | 104 |  |   | 71 
|                                       |  |                               |        |   |                               |   |             |                                      |  |   |        |   |                                 |  |                            |   |                            |  |   |     |  |   |    
|Total earnings (loss)(2)               |  | $                             | (7,812 | ) |                               | $ | (1,653      | )                                    |  | $ | (2,449 | ) |                                 |  |                            | $ | 527                        |  | $ | 728 |  | $ | 337
|                                       |  |                               |        |   |                               |   |             |                                      |  |   |        |   |                                 |  |                            |   |                            |  |   |     |  |   |    
|Fixed charges:                         |  |                               |        |   |                               |   |             |                                      |  |   |        |   |                                 |  |                            |   |                            |  |   |     |  |   |    
|Interest expense                       |  | $                             | 659    |   |                               | $ | 834         |                                      |  | $ | 71     |   |                                 |  |                            | $ | 93                         |  | $ | 85  |  | $ | 51 
|Rent expense interest factor           |  |                               | 6      |   |                               |   | 12          |                                      |  |   | 1      |   |                                 |  |                            |   | 14                         |  |   | 19  |  |   | 20 
|                                       |  |                               |        |   |                               |   |             |                                      |  |   |        |   |                                 |  |                            |   |                            |  |   |     |  |   |    
|Total fixed charges                    |  | $                             | 665    |   |                               | $ | 846         |                                      |  | $ | 72     |   |                                 |  |                            | $ | 107                        |  | $ | 104 |  | $ | 71 
|                                       |  |                               |        |   |                               |   |             |                                      |  |   |        |   |                                 |  |                            |   |                            |  |   |     |  |   |    
|Ratio of earnings to fixed charges     |  |                               |       |   |                               |   |            |                                      |  |   |       |   |                                 |  |                            |   | 4.9                        |  |   | 7.0 |  |   | 4.7
|                                       |  |                               |        |   |                               |   |             |                                      |  |   |        |   |                                 |  |                            |   |                            |  |   |     |  |   |    



|(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.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------