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): April 30, 2008

SILICON LABORATORIES INC.

(Exact Name of Registrant as Specified in Charter)

     400 West Cesar Chavez, Austin, TX          78701

(Address of Principal Executive Offices) (Zip Code)

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):

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

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

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

¨ 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 April 30, 2008, Silicon Laboratories Inc. (“Silicon Laboratories”) issued a press release describing its results of operations for its fiscal quarter ended April 5, 2008.  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 April 30, 2008.

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 REPORTS STRONG FIRST QUARTER RESULTS

—Company Grows Revenue by 33 Percent and Expands Earnings and Operating Income—

AUSTIN, Texas — April 30, 2008 — Silicon Laboratories Inc. (Nasdaq: SLAB), a leader in high-performance, analog-intensive, mixed-signal integrated circuits (ICs), today reported better than expected first quarter revenue of $98.2 million, a 33 percent increase over the same period last year. Earnings per share for the quarter exceeded guidance, and the company nearly tripled operating income compared to the same period last year.

Financial Results

The company delivered favorable results across the board during the first quarter. Revenue of $98.2 million exceeded guidance.  GAAP gross margin was 61.5 percent, GAAP operating income increased year-over-year to $11 million, and GAAP diluted earnings per share from continuing operations increased significantly compared to the same period last year to $0.21.

The following non-GAAP results exclude certain non-cash charges. Non-GAAP gross margin of 61.8 percent was at the high end of the corporate range of 60 to 62 percent. Operating expenses were slightly lower than expected, resulting in non-GAAP operating income of $21.3 million, or 21.7 percent of revenue, representing very strong operating performance relative to seasonal market trends. It also marks a near tripling of non-GAAP operating income from the same period last year. Non-GAAP diluted earnings per share from continuing operations was $0.38, representing a year-over-year increase of more than 100 percent. The reconciling charges are set forth in the financial measures table included below.

During the first quarter the company continued aggressive execution of its share repurchase program, completing repurchases totaling $137 million. The company ended the quarter with $467 million in cash, cash equivalents and investments.

Business Summary

Strong operating performance in the first quarter was coupled with a number of positive business drivers. A doubling of channel design wins for the broad-based products year-over-year, a strong quarter of new product announcements and the addition of new tier-one customers and design wins all offer strong indications of solid momentum in the business.

Broadcast revenue to handset customers increased sequentially in what is typically a seasonally weak quarter, demonstrating the strong competitive position of the company’s broadcast audio solutions. The company announced new products in both audio and video broadcast that further differentiate Silicon Labs from the competition. The continued adoption of the current portfolio, increasing attach rates and a record number of design wins, clearly demonstrated the strength and long-term potential of the business.

The MCU business was up almost 40 percent over the same quarter last year and down sequentially due to seasonal weakness primarily in the portable navigation market. Record development kit shipments, a high rate of design win activity and new product introductions continued throughout the quarter, including the introduction of the industry’s first 8-bit MCUs capable of operating with only a single cell battery. Healthy business trends are expected to drive the MCU product line to sequential revenue growth in the second quarter.

Demand for timing products and stable performance of the company’s foundation businesses also supported the strong results.

“We have a global business, a number of new product cycles and new tier-one customers beginning to ramp. We’re introducing products at an accelerated pace and continuing to fortify our leadership position in key markets,” said Necip Sayiner, president and chief executive officer

of Silicon Laboratories. “Together with strong operational performance and conservative financial management, we are delivering a combination of growth and profitability virtually unmatched in our sector.”

For the second quarter of 2008, the company is guiding revenue in the range of $98 to $101 million.

Webcast and Conference Call

A conference call discussing the first 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 866-446-5477 or +1 203-369-1151 (international). Replays will be available through May, 14 2008.

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 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; 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 and divestitures; 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 and the Silicon Labs logo are trademarks of Silicon Laboratories Inc. All other product names noted herein may be trademarks of their respective holders.

CONTACT: Silicon Laboratories Inc., Shannon Pleasant, (512) 464 9254, shannon.pleasant@silabs.com

Silicon Laboratories Inc.

Condensed Consolidated Statements of Income

(In thousands, except per share data)

(Unaudited)

Unaudited Reconciliation of GAAP to Non-GAAP Financial Measures

(In thousands, except per share data)

Silicon Laboratories Inc.

Condensed Consolidated Balance Sheets

(In thousands, except per share data)

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