Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
SOOCH NAVDEEP S
   2. Issuer Name and Ticker or Trading Symbol
SILICON LABORATORIES INC [SLAB] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
4635 BOSTON LANE		 3. Date of Earliest Transaction (Month/Day/Year)
12/27/2004
(Street)

AUSTIN, TX 78735		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock, $0.0001 par value 12/27/2004   S   28,016 (1) D $ 35.0768 (2) 1,505,369 D  
Common Stock, $0.0001 par value 12/27/2004   S   1,681 (1) D $ 35.0768 (2) 89,838 I By Libra II, L.P. (3)
Common Stock, $0.0001 par value 12/27/2004   S   560 (1) D $ 35.0768 (2) 13,112 I David T. Sooch Trust (4)
Common Stock, $0.0001 par value 12/27/2004   S   560 (1) D $ 35.0768 (2) 13,112 I Kelly A. Sooch Trust (4)
Common Stock, $0.0001 par value 12/27/2004   S   560 (1) D $ 35.0768 (2) 13,112 I Kevin S. Sooch Trust (4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Option (right to buy) $ 15.1             09/21/2001(5) 09/21/2011 Common Stock, $0.0001 par value 16,500   16,500 (6) D  
Non-Qualified Stock Option (right to buy) $ 15.1             10/21/2001(7) 09/21/2011 Common Stock, $0.0001 par value 125,000   125,000 (8) D  
Non-Qualified Stock Option (right to buy) $ 24.3             07/13/2005(9) 06/13/2012 Common Stock, $0.0001 par value 100,000   100,000 (10) D  
Non-Qualified Stock Option (right to buy) $ 33.17             08/10/2005(11) 08/10/2014 Common Stock, $0.0001 par value 1,195   1,195 (12) D  
Non-Qualified Stock Option (right to buy) $ 38.5             08/18/2004(11) 08/18/2013 Common Stock, $0.0001 par value 10,000   10,000 (13) D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
SOOCH NAVDEEP S
4635 BOSTON LANE
AUSTIN, TX 78735		   X      

Signatures

 Bruce A. Maurer, Power of Attorney for Navdeep S. Sooch   12/28/2004
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Shares sold pursuant to reporting person's 10(b)5-1 plan.
(2) Price represents the weighted average selling price. Prices range between $35.00 and $35.25.
(3) These shares are held in a family limited partnership.
(4) These shares are held in a trust for the benefit of the reporting person's children. The reporting person is co-trustee of the trust.
(5) This option is 100% vested and exercisable on the date of grant.
(6) On December 13, 2004 options to acquire 16,500 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.
(7) This option becomes exercisable as it vests in a series of sixty (60) successive equal monthly installments measured from the date of grant.
(8) On December 13, 2004 options to acquire 125,000 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.
(9) The option becomes exercisable as it vests in a series of twelve (12) successive equal monthly installments measured from June 13, 2005.
(10) On December 13, 2004 options to acquire 100,000 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.
(11) Option vests and becomes exercisable with respect to (i) twenty percent (20%) of the option shares upon optionee's completion of one year of service measured from the grant date and (ii) the balance of the option shares in a series of forty-eight (48) successive monthly installments over the forty-eight (48) month period measured from the first year anniversary of the grant date.
(12) On December 13, 2004 options to acquire 12,500 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.
(13) On December 13, 2004 options to acquire 10,000 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.

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