SEC Form 3

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 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Walsh Paul V Jr (Last) (First) (Middle) 4635 BOSTON LANE (Street) AUSTIN TX 78735 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 05/12/2006	3. Issuer Name and Ticker or Trading Symbol SILICON LABORATORIES INC [ SLAB ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) Interim Vice President & CFO	5. If Amendment, Date of 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

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	7,833(1)	D

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: 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
Incentive Stock Option (right to buy)	05/02/2006(2)	05/02/2015	Common Stock, $0.0001 par value	6,025	25.07	D
Incentive Stock Option (right to buy)	02/02/2005(2)	02/02/2014	Common Stock, $0.0001 par value	5,167	50.48	D
Non-Qualified Stock Option (right to buy)	05/02/2006(2)	05/02/2015	Common Stock, $0.0001 par value	3,975	25.07	D
Non-Qualified Stock Option (right to buy)	02/02/2005(2)	02/02/2014	Common Stock, $0.0001 par value	4,833	50.48	D

Explanation of Responses:

1. Reflects restricted stock units that represent the contingent right to receive one share of common stock per restricted stock unit. 4,500 restricted stock units vest at the rate of one-third (1/3) on the third, fourth and fifth anniversary dates after September 12, 2005. 3333 restricted stock units vest at the rate of 20% on each of the first five anniversary dates after September 12, 2005. All restricted stock units will be settled pursuant to the terms of the Issuer's 2000 Stock Incentive Plan.

2. 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 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.

	Paul V Walsh Jr.	05/19/2006
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
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