Exhibit 12.1

Freescale Semiconductor Holdings I, Ltd. and Subsidiaries

Computation of Ratio of Earnings to
Fixed Charges

(in millions)



|                                       |                               |           |        |                                                 |  |      |        |      |             |         |                                            |  |                          |   |     |  |   |     |  |   |     |  |   |      |  
|-------------------------------------- | ----------------------------- | --------- | ------ | ----------------------------------------------- |  | ---- | ------ | ---- | ----------- | ------- | ------------------------------------------ |  | ------------------------ | - | --- |  | - | --- |  | - | --- |  | - | ---- | -
|                                       |                               | Successor |        |                                                 |  |      |        |      | Predecessor |        
|                                       | Year EndedDecember 31,2007(3) |           |        | Period fromDecember 2throughDecember 31,2006(3) |  |      |        |      |             |         | Period fromJanuary 1throughDecember 1,2006 |  | Years Ended December 31, |  
|                                       |                               |           |        |                                                 |  | 2005 |        | 2004 |             | 2003(3) |                                           
|Earnings:                              |                               |           |        |                                                 |  |      |        |      |             |         |                                            |  |                          |   |     |  |   |     |  |   |     |  |   |      |  
|(Loss) earnings before income taxes(1) |                               | $         | (2,499 | )                                               |  | $    | (2,521 | )    |             |         |                                            |  |                          | $ | 420 |  | $ | 624 |  | $ | 266 |  | $ | (322 | )
|Less: Capitalized interest             |                               |           |       |                                                 |  |      |       |      |             |         |                                            |  |                          |   |    |  |   |    |  |   |    |  |   |     |  
|Add: Fixed charges (per below)         |                               |           | 846    |                                                 |  |      | 72     |      |             |         |                                            |  |                          |   | 107 |  |   | 104 |  |   | 71  |  |   | 137  |  
|                                       |                               |           |        |                                                 |  |      |        |      |             |         |                                            |  |                          |   |     |  |   |     |  |   |     |  |   |      |  
|Total (loss)earnings(2)                |                               | $         | (1,653 | )                                               |  | $    | (2,449 | )    |             |         |                                            |  |                          | $ | 527 |  | $ | 728 |  | $ | 337 |  | $ | (185 | )
|                                       |                               |           |        |                                                 |  |      |        |      |             |         |                                            |  |                          |   |     |  |   |     |  |   |     |  |   |      |  
|Fixed charges:                         |                               |           |        |                                                 |  |      |        |      |             |         |                                            |  |                          |   |     |  |   |     |  |   |     |  |   |      |  
|Interest expense                       |                               | $         | 834    |                                                 |  | $    | 71     |      |             |         |                                            |  |                          | $ | 93  |  | $ | 85  |  | $ | 51  |  | $ | 115  |  
|Rent expense interest factor           |                               |           | 12     |                                                 |  |      | 1      |      |             |         |                                            |  |                          |   | 14  |  |   | 19  |  |   | 20  |  |   | 22   |  
|                                       |                               |           |        |                                                 |  |      |        |      |             |         |                                            |  |                          |   |     |  |   |     |  |   |     |  |   |      |  
|Total fixed charges                    |                               | $         | 846    |                                                 |  | $    | 72     |      |             |         |                                            |  |                          | $ | 107 |  | $ | 104 |  | $ | 71  |  | $ | 137  |  
|                                       |                               |           |        |                                                 |  |      |        |      |             |         |                                            |  |                          |   |     |  |   |     |  |   |     |  |   |      |  
|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, 2007, the period from December 2, 2006 through December 31, 2006 and for the year
ended December 31, 2003 by $2.5 billion, $2.5 billion and $322 million, respectively.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------