Exhibit 99.4

Dear Intersil Colleagues:

I am very pleased that our two teams - Intersil and Renesas - have decided to join forces to win in the global semiconductor market, although we need to take some regulatory steps to close the transaction.

We are very excited about the highly synergistic and complementary combination of the two companies which will dramatically enhance our competitive advantage in the strategic market segments. A larger business platform as well as cross-cultural work environment will surely provide you with greater opportunities to grow not only as a business but also as individuals. You will find bigger and more diversified opportunities in the new setting.

While we are both technology oriented companies, at the end of the day, what really matters is the people. Renesas puts the highest priority on people, and Intersil seems to do the same. I have found a very good chemistry between the Intersil and Renesas management teams. Both of us embrace technology, customer focus, business success, global mindset, and above all, trust in people. I am totally convinced that we can make this sense of personal trust and good cultural chemistry prevail across our entire two companies, which will be the key to our common success.

Renesas is fully committed to our close collaboration moving forward, and the success of our joint future.

I very much look forward to working with you all soon.

Welcome to Renesas.

Sincerely,

Bunsei Kure

Representative Director, President & CEO

Renesas Electronics Corporation

Renesas Electronics Corporation

TOYOSU FORESIA, 3-2-24, Toyosu, Koto-ku, Tokyo 135-0061, Japan Tel:03-6773-3000 URL:http://www.renesas.com

Additional Information and Where to Find It

This communication is being made in respect of the proposed transaction involving Intersil and Renesas. Intersil intends to file with the SEC a proxy statement in connection with the proposed transaction with Renesas as well as other documents regarding the proposed transaction. The definitive proxy statement will be sent or given to the stockholders of Intersil and will contain important information about the proposed transaction and related matters. INTERSIL’S SECURITY HOLDERS ARE URGED TO READ THE PROXY STATEMENT REGARDING THE PROPOSED TRANSACTION AND ANY OTHER RELEVANT DOCUMENTS CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. The proxy statement and other relevant materials (when they become available), and any other documents filed by Intersil with the SEC, may be obtained free of charge at the SEC’s website, at www.sec.gov. In addition, security holders of Intersil will be able to obtain free copies of the proxy statement through Intersil’s website, www.intersil.com, or by contacting Intersil by mail at Attn: Corporate Secretary, 1001 Murphy Ranch Road, Milpitas, California 95035.

Participants in the Solicitation

Intersil, Renesas and their respective directors, executive officers and other members of management and certain of their respective employees may be deemed to be participants in the solicitation of proxies in connection with the proposed merger. Information about Intersil’s directors and executive officers is included in Intersil’s Annual Report on Form 10-K for the fiscal year ended January 1, 2016 filed with the SEC on February 12, 2016, and the proxy statement filed with the SEC on March 4, 2016 for Intersil’s annual meeting of stockholders held on April 21, 2016. Additional information regarding these persons and their interests in the merger will be included in the proxy statement relating to the proposed merger when it is filed with the SEC. These documents, when available, can be obtained free of charge from the sources indicated above.

Safe Harbor for Forward-looking Statements

Throughout this document pertaining to the merger transaction between Intersil and Renesas, Intersil makes forward-looking statements, as defined in the Private Securities Litigation Reform Act of 1995, within the meaning of the federal securities laws, including Section 27A

Renesas Electronics Corporation

TOYOSU FORESIA, 3-2-24, Toyosu, Koto-ku, Tokyo 135-0061, Japan Tel:03-6773-3000 URL:http://www.renesas.com

of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, as amended. You should not place undue reliance on these statements. These forward-looking statements include statements that reflect the current expectations, estimates, beliefs, assumptions, and projections of Intersil’s senior management about future events with respect to Intersil’s business and its industry in general. Statements that include words such as “anticipates,” “expects,” “intends,” “plans,” “predicts,” “believes,” “seeks,” “estimates,” “may,” “will,” “should,” “would,” “potential,” “continue,” “goals,” “targets” and variations of these words (or negatives of these words) or similar expressions of a future or forward-looking nature identify forward-looking statements. In addition, any statements that refer to projections or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking statements. Although Intersil believes the expectations reflected in any forward-looking statements are reasonable, they involve known and unknown risks and uncertainties, are not guarantees of future performance, and actual results, performance or achievements may differ materially from any future results, performance or achievements expressed or implied by such forward-looking statements and any or all of Intersil’s forward-looking statements may prove to be incorrect. Consequently, no forward-looking statements may be guaranteed and there can be no assurance that the actual results or developments anticipated by such forward looking statements will be realized or, even if substantially realized, that they will have the expected consequences to, or effects on, Intersil or its businesses or operations. Factors which could cause Intersil’s actual results to differ from those projected or contemplated in any such forward-looking statements include, but are not limited to, the following factors: the ability of the parties to consummate the merger transaction in a timely manner or at all; satisfaction of the conditions precedent to consummation of the merger transaction, including the ability to secure regulatory approvals in a timely manner or at all, and approval by Intersil’s stockholders; the possibility of litigation and other unknown liabilities; the parties’ ability to successfully integrate their operations, product lines, technology and employees and realize synergies and other benefits from the merger transaction; the potential impact of the announcement or consummation of the merger transaction on the parties’ relationships with customers, suppliers and other third parties; and other risks described in Intersil’s filings with the SEC. The foregoing review of important factors that could cause actual events to differ from expectations should not be construed as exhaustive and should be read in conjunction with statements that are included herein and elsewhere, including the risk factors included in Intersil’s most recent Annual Report on Form 10-K, and Intersil’s more recent Quarterly Report on Form 10-Q and Current Reports on Form 8-K filed with the SEC (which you may obtain for free at the SEC’s website at http://www.sec.gov or on Intersil’s website at http://ir.intersil.com). Intersil can give no assurance that the conditions to the merger will be satisfied. Except as required by applicable

Renesas Electronics Corporation

TOYOSU FORESIA, 3-2-24, Toyosu, Koto-ku, Tokyo 135-0061, Japan Tel:03-6773-3000 URL:http://www.renesas.com

law, Intersil cannot undertake any obligation to revise or update any forward-looking statement, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise. Intersil does not intend, and assumes no obligation, to update any forward-looking statements.

Renesas Electronics Corporation

TOYOSU FORESIA, 3-2-24, Toyosu, Koto-ku, Tokyo 135-0061, Japan Tel:03-6773-3000 URL:http://www.renesas.com