Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  Downing Mark A
 2. Date of Event Requiring Statement (Month/Day/Year)
04/27/2012		 3. Issuer Name and Ticker or Trading Symbol
SILICON LABORATORIES INC [SLAB]
(Last)
(First)
(Middle)
400 WEST CESAR CHAVEZ		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Sr Vice President, Broad Based
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

AUSTIN, TX 78701		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock, $0.0001 par value 24,720 (1)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Option (right to buy) 07/23/2008(2) 07/23/2017 Common Stock, $0.0001 par value 63,756 $ 37.44 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Downing Mark A
400 WEST CESAR CHAVEZ
AUSTIN, TX 78701		       Sr Vice President, Broad Based  

Signatures

Mark A. Downing 05/02/2012
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) Includes 21,014 restricted stock units (RSUs) that will entitle Reporting Person to receive one share of common stock per RSU. 8,607 RSUs will vest on February 15, 2013, 5,817 RSUs will vest on February 15, 2014, 3,592 RSUs will vest on February 15, 2015, and 2,998 RSUs will vest on April 15, 2015. All RSUs will be settled pursuant to the terms of the Issuer's 2009 Stock Incentive Plan.
(2) Option vests and becomes exercisable with respect to (i) twenty percent (20%) of the option shares upon the date exercisable 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 date exercisable.

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