UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): January 31, 2007

SILICON LABORATORIES INC.

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code: (512) 416-8500

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o            Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o            Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o            Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o            Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 2.02.  Results of Operations and Financial Condition

On January 31, 2007, Silicon Laboratories Inc. (“Silicon Laboratories”) issued a press release describing its results of operations for its fiscal quarter and year ended December 30, 2006.  A copy of the press release is attached as Exhibit 99 to this report.

Item 9.01.  Financial Statements and Exhibits

(d) Exhibits.

99  Press Release of Silicon Laboratories Inc. dated January 31, 2007.

Use of Non-GAAP Financial Information

From time to time, Silicon Laboratories provides certain non-GAAP financial measures as additional information relating to its operating results.  The non-GAAP financial measurements provided in the press release furnished herewith do not replace the presentation of Silicon Laboratories’ GAAP financial results. These additional measurements merely provide supplemental information to assist investors in analyzing Silicon Laboratories’ financial position and results of operations; however, these measures are not in accordance with, or an alternative to, GAAP and may be different from non-GAAP measures used by other companies. Silicon Laboratories has chosen to provide this information to investors because it believes that such supplemental information enables them to perform meaningful comparisons of past, present and future operating results, and as a means to highlight the results of core ongoing operations.

Pursuant to the requirements of Regulation G, we have provided in the press release furnished with this report a reconciliation of the non-GAAP financial measures to the most directly comparable GAAP financial measures.

The information in this report, including the exhibit hereto, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section.  The information contained therein and in the accompanying exhibit shall not be incorporated by reference into any filing with the U.S. Securities and Exchange Commission made by Silicon Laboratories, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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EXHIBIT INDEX

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Exhibit 99

SILICON LABORATORIES ANNOUNCES FOURTH QUARTER RESULTS

AUSTIN, Texas — January 31, 2007 — Silicon Laboratories Inc. (Nasdaq: SLAB), a leader in high-performance, analog-intensive, mixed-signal integrated circuits (ICs), today reported fourth quarter revenue of $111 million.

Fourth Quarter Financial Highlights

Gross margin for the fourth quarter was 53.4 percent, which was above the company’s previously stated guidance range of 52 to 53 percent. GAAP operating income was $2.6 million. Non-GAAP operating income was $12.7 million, or 11.4 percent of revenue. GAAP net income for the fourth quarter was $5.2 million, or $0.09 per fully diluted share. Non-GAAP net income, excluding certain charges, was $13.5 million, or $0.24 per fully diluted share. The reconciling charges are set forth in the reconciliation of GAAP to non-GAAP financial measures table included below.

The company’s balance sheet continued to be strong with cash, cash equivalents and short-term investments totaling approximately $386 million at December 30, 2006. During the quarter, the company repurchased shares of its common stock under its repurchase program at a cost of approximately $15 million.

“We achieved year-over-year revenue growth while managing through multiple product transitions in our mobile handset business and experiencing an overall industry slowdown in the second half of the year,” said Necip Sayiner, President and CEO of Silicon Laboratories. “We continue to create a diverse set of growth drivers within our business and execute on our new product introductions in our effort to drive double digit growth in 2007.”

Business Summary

During the fourth quarter, the company experienced strong demand for its Broadcast products, in particular FM tuners and satellite receivers.  The broad-based mixed-signal business experienced a slight decline on a sequential basis due to lower modem shipments.

The mobile handset business performed within the company’s guidance for the fourth quarter.    Silicon Laboratories experienced a decline in the total GSM/GPRS transceiver shipments, which was largely offset by the increase in EDGE transceiver shipments, initial AeroFONE™ revenue and FM tuner growth.

Business Outlook

For the first quarter of 2007, the company anticipates revenue to be in a range of $106 to $111 million.

Webcast and Conference Call

A conference call discussing the fourth quarter results will follow this press release today at 7:30 a.m. Central Time.  An audio webcast will be available simultaneously on Silicon Laboratories’ website under Investor Relations (www.silabs.com).  A replay will be available after the call at the same website listed above or by calling 800-801-6154 or +1-402-280-1615 (international). Replays will be available through February 14, 2007.

About Silicon Laboratories Inc.

Silicon Laboratories Inc. is a leading designer of high-performance, analog-intensive, mixed-signal integrated circuits (ICs) for a broad range of applications. Silicon Laboratories’ diverse portfolio of highly integrated, patented solutions is developed by a world-class engineering team with decades of cumulative expertise in cutting-edge mixed-signal design. The company has design, engineering, marketing, sales and applications offices throughout North America, Europe and Asia. For more information about Silicon Laboratories, please visit www.silabs.com.

Forward Looking Statements

This press release contains forward-looking statements based on Silicon Laboratories’ current expectations. The words “believe,” “estimate,” “expect,” “intend,” “anticipate,” “plan,” “project,” “will” and similar phrases as they relate to Silicon Laboratories are intended to identify such forward-looking statements. These forward-looking statements reflect the current views and assumptions of Silicon Laboratories and are subject to various risks and uncertainties that could cause actual results to differ materially from expectations. Among the factors that could cause actual results to differ materially from those in the forward-looking statements are the following: risks that Silicon Laboratories may not be able to maintain its historical growth; quarterly fluctuations in revenues and operating results; volatile stock price; average selling prices of products may decrease significantly and rapidly, dependence on a limited number of products and customers; risks associated with shifting market demand from GSM/GPRS to EDGE and WCDMA; difficulties developing new products that achieve market acceptance; risks that

Silicon Laboratories may not be able to manage strains associated with its growth; dependence on key personnel; difficulties managing our manufacturers and subcontractors; difficulties managing international activities; credit risks associated with our accounts receivable; geographic concentration of manufacturers, assemblers, test service providers and customers in the Pacific Rim that subjects Silicon Laboratories’ business and results of operations to risks of natural disasters, epidemics, war and political unrest; product development risks; inventory-related risks; intellectual property litigation risks; risks associated with acquisitions; the competitive and cyclical nature of the semiconductor industry and other factors that are detailed in Silicon Laboratories’ filings with the SEC. Silicon Laboratories disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Note to editors: Silicon Laboratories, Silicon Labs, AeroFONE and the Silicon Labs logo are trademarks of Silicon Laboratories Inc. All other product names noted herein may be trademarks of their respective holders.

Investor Contact:

Kellie Nugent

Director, Investor Relations

Shelton Group for Silicon Laboratories

972-239-5119 x 125

knugent@sheltongroup.com

Media Contact:

Kirstan Ryan

Public Relations Manager

Silicon Laboratories

512.416.8500

kirstan.ryan@silabs.com

(Financial Tables to Follow)