EXHIBIT 32.2

SECTION 1350 CERTIFICATION (PRINCIPAL FINANCIAL OFFICER)

In connection with the Quarterly Report of Lam Research Corporation (the “Company”) on Form 10-Q for the fiscal period ending March 25, 2007 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Martin B. Anstice, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

April 27, 2007

/s/ Martin B. Anstice  

Martin B. Anstice 

Senior Vice President, Chief Financial Officer and Chief Accounting Officer