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* Rabinovitsj Daniel A (Last) (First) (Middle) 4635 BOSTON LANE (Street) AUSTIN TX 78735 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 04/25/2005	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) Vice President	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	3,541	D
Common Stock, $0.0001 par value	775	I	D. Rabinovitsj GRAT
Common Stock, $0.0001 par value	775	I	E. Rabinovitsj GRAT
Common Stock, $0.0001 par value	409	I	by Spouse

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)	03/23/2001(1)	03/23/2010	Common Stock, $0.0001 par value	308	31	D
Incentive Stock Option (right to buy)	07/20/1999(2)	07/20/2009	Common Stock, $0.0001 par value	7,334	1.75	D
Incentive Stock Option (right to buy)	01/14/2004(3)	09/21/2011	Common Stock, $0.0001 par value	1,314	15.1	D
Incentive Stock Option (right to buy)	07/13/2005(4)	06/13/2012	Common Stock, $0.0001 par value	3,527	24.3	D
Incentive Stock Option (right to buy)	01/14/2004(5)	03/23/2010	Common Stock, $0.0001 par value	2,121	31	D
Non-Qualified Stock Option (right to buy)	03/23/2001(1)	03/23/2010	Common Stock, $0.0001 par value	360	31	D
Non-Qualified Stock Option (right to buy)	01/14/2004(3)	09/21/2011	Common Stock, $0.0001 par value	12,853	15.1	D
Non-Qualified Stock Option (right to buy)	04/16/2001(6)	03/16/2011	Common Stock, $0.0001 par value	3,250	15.44	D
Non-Qualified Stock Option (right to buy)	08/18/2001(7)	07/18/2011	Common Stock, $0.0001 par value	5,667	22.63	D
Non-Qualified Stock Option (right to buy)	07/13/2005(4)	06/13/2012	Common Stock, $0.0001 par value	3,973	24.3	D
Non-Qualified Stock Option (right to buy)	01/14/2004(5)	03/23/2010	Common Stock, $0.0001 par value	7,047	31	D
Non-Qualified Stock Option (right to buy)	08/10/2005(1)	08/10/2014	Common Stock, $0.0001 par value	10,000	33.17	D
Non-Qualified Stock Option (right to buy)	08/18/2004(1)	08/18/2013	Common Stock, $0.0001 par value	5,000	38.5	D

Explanation of Responses:

1. The 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.

2. This option becomes exercisable as it vests in a series of thirty-six (36) successive equal monthly installments measured from December 14, 2003.

3. This option becomes exercisable as it vests in a series of forty eight (48) equal monthly installments measured from December 14, 2003.

4. This option becomes exercisable as it vests in a series of twelve (12) successive equal monthly installments measured from June 13, 2005.

5. This option becomes exercisable as it vests in a series of thirty-six (36) equal monthly installments measured from December 14, 2003.

6. This option becomes exercisable as it vests in a series of sixty (60) successive equal monthly installments measured from March 16, 2001.

7. This option becomes exercisable as it vests in a series of sixty (60) successive equal monthly installments measured from July 18, 2001.

	Daniel A. Rabinovitsj	05/03/2005
	** 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).
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