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): February 22, 2013

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):

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 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On February 22, 2013, Silicon Laboratories Inc. (“Silicon Laboratories”) issued a press release announcing the appointment of Bill Bock as interim Chief Financial Officer and Senior Vice President effective as of February 22, 2013.

Mr. Bock, age 62, has served as a director of Silicon Laboratories since he rejoined the Board of Directors in July of 2011. He served Silicon Laboratories as Chief Financial Officer from November 2006 to July 2011, and Senior Vice President of Finance and Administration through December 2011. He joined Silicon Laboratories as a director in March 2000, and served as Chairman of the audit committee until November 2006 when he stepped down from the Board of Directors to assume the CFO role. From 2001 to 2006, Mr. Bock participated in the venture capital industry, principally as a partner with CenterPoint Ventures. Before his venture career, Mr. Bock held senior management positions with three venture-backed companies: DAZEL Corporation, Tivoli Systems, and Convex Computer Corporation. Mr. Bock began his career with Texas Instruments. Mr. Bock served on the Board of Directors of Convio, Inc., from January 2008 until its sale to Blackbaud Inc. in April 2012. Mr. Bock currently serves on the Board of Directors of Entropic Communications and is a member of their Audit Committee. Mr. Bock also serves as an independent business consultant to Foros Group, a mergers and acquisitions advisory firm, and several private technology companies. Mr. Bock holds a B.S. in Computer Science from Iowa State University and an M.S. in Industrial Administration from Carnegie Mellon University. The terms of Mr. Bock’s compensation as interim Chief Financial Officer and Senior Vice President have not been determined. Mr. Bock will continue to serve on Silicon Laboratories’ Board of Directors.

Mr. Bock will replace Paul V. Walsh, Jr., who has resigned as Senior Vice President and Chief Financial Officer effective as of February 22, 2013.

The press release announcing the appointment of Mr. Bock is attached hereto as Exhibit 99.

Item 9.01. Financial Statements and Exhibits

(d) Exhibits.

99  Press Release of Silicon Laboratories Inc. dated February 22, 2013.

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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 LABS APPOINTS BILL BOCK AS INTERIM CFO

— Current Board Member and Former CFO Returns to Management Team —

AUSTIN, Texas — Feb. 22, 2013 — Silicon Labs (Nasdaq: SLAB), a leader in high-performance, analog-intensive, mixed-signal integrated circuits (ICs), today announced that the company’s CFO, Paul Walsh, is leaving Silicon Labs for another opportunity outside of the semiconductor industry. Silicon Labs’ former CFO and current board member, Bill Bock, will be returning to the management team as the interim CFO.

Mr. Bock will be leading a strong and proven global finance organization that has been built over the last decade to support the expansion of the business. The CFO transition is not expected to result in any changes to Silicon Labs’ financial philosophy or the target financial model. The company is also confident in its near-term prospects and reiterated guidance for the current quarter.

“I want to thank Paul for his many contributions to Silicon Labs. I’ve enjoyed working with him, and we all wish him well in the next phase of his career,” said Tyson Tuttle, president and chief executive officer of Silicon Labs. “I am confident that Bill’s history with Silicon Labs will enable a seamless transition. Bill has been a tremendous asset to the company, and I look forward to working closely with him in our efforts to build a high-growth, broad-based business.”

Mr. Bock joined Silicon Labs’ board of directors in 2000 and then left the board when he was appointed CFO in 2006. He retired from Silicon Labs’ management team in 2011 and was invited to rejoin the board at that time.  In addition to his familiarity with Silicon Labs’ products, strategy and mixed-signal history, Mr. Bock brings more than 30 years of experience spanning

finance, operations and sales. Mr. Bock currently serves on a number of public and private company boards of directors including Entropic Communications. He served as president and chief executive officer of DAZEL Corporation, a provider of electronic information delivery systems. After DAZEL’s acquisition by HP, Mr. Bock served as vice president for HP until 2001. Prior to DAZEL, Mr. Bock served as executive vice president and chief operating officer of Tivoli Systems, a client server software company, which he helped to take public in 1995 before its acquisition by IBM in 1996. Prior to joining Tivoli, Mr. Bock successfully completed an IPO at Convex Computer Corporation as CFO in 1986 and then became senior vice president of sales in 1991. Mr. Bock also spent nine years in various finance roles at Texas Instruments including vice president and controller of TI’s data systems group.

Mr. Bock holds a bachelor’s degree in Computer Science from Iowa State University and a master’s degree in Industrial Administration from Carnegie Mellon University.

Silicon Labs

Silicon Labs is an industry leader in the innovation of high-performance, analog-intensive, mixed-signal ICs. Developed by a world-class engineering team with unsurpassed expertise in mixed-signal design, Silicon Labs’ diverse portfolio of patented semiconductor solutions offers customers significant advantages in performance, size and power consumption. For more information about Silicon Labs, please visit www.silabs.com.

Cautionary Language

This press release contains forward-looking statements based on Silicon Labs’ 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 Labs 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 Labs 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; difficulties developing new products that achieve market acceptance; dependence on a limited number of products and customers; intellectual property litigation risks; inventory-related risks; risks associated with acquisitions; difficulties managing international activities; difficulties managing our manufacturers and subcontractors; risks that Silicon Labs may not be able to manage strains associated with its growth; credit risks associated with our accounts receivable; dependence on key personnel; risks associated with divestitures; geographic concentration of manufacturers, assemblers, test service providers and customers in Asia that subjects Silicon Labs’ business and results of operations to risks of natural disasters, epidemics, war and political unrest; the competitive and cyclical nature of the semiconductor industry and other factors that are detailed in Silicon Labs’ filings with the SEC. Silicon Labs 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 Labs, Shannon Pleasant, (512) 464 9254, shannon.pleasant@silabs.com

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