Exhibit 5.1

                                 April 10, 2002



LSI Logic Corporation
1551 McCarthy Boulevard
Milpitas, California  95035

        RE:    REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

          We have examined the registration statement on Form S-3 to be filed by
you with the Securities and Exchange Commission on or about April 10, 2002 (the
"Registration Statement"), in connection with the registration under the
Securities Act of 1933, of 651,488 shares of Common Stock, to be sold by a
certain stockholder listed in the Registration Statement. As your counsel, we
have examined the transactions taken and proposed to be taken in connection with
the sale of such shares by such stockholders in the manner set forth in the
Registration Statement.

          It is our opinion that such shares, if sold by such stockholder in the
manner set forth in the Registration Statement, will be legally and validly
issued, fully paid and nonassessable.

          We consent to the use of this opinion as an exhibit to the
Registration Statement, and further consent to the use of our name wherever
appearing in the Registration Statement, including the prospectus constituting a
part thereof, and any amendment thereto.

                                            Very truly yours,

                                            WILSON SONSINI GOODRICH & ROSATI
                                            Professional Corporation

                                            /s/ Wilson Sonsini Goodrich & Rosati