EXHIBIT 5

             OPINION AND CONSENT OF BROBECK, PHLEGER & HARRISON LLP



March 6, 2002


Silicon Laboratories Inc.
4635 Boston Lane
Austin, Texas 78735

Re:      SILICON LABORATORIES INC. - REGISTRATION STATEMENT FOR OFFERING OF AN
         AGGREGATE OF 2,675,203 SHARES OF COMMON STOCK

Ladies and Gentlemen:

We have acted as counsel to Silicon Laboratories Inc., a Delaware corporation
(the "Company"), in connection with the registration on Form S-8 (the
"Registration Statement") under the Securities Act of 1933, as amended, of
2,675,203 additional shares of the Company's common stock (the "Shares") for
issuance under the Company's 2000 Stock Incentive Plan and the Employee Stock
Purchase Plan (the "Plans").

This opinion is being furnished in accordance with the requirements of Item 8
of Form S-8 and Item 601(b)(5)(i) of Regulation S-K.

We have reviewed the Company's charter documents and the corporate
proceedings taken by the Company in connection with the establishment and
implementation of the Plans. Based on such review, we are of the opinion
that, if, as and when the Shares have been issued and sold (and the
consideration therefor received) pursuant to the (a) provisions of stock
option agreements duly authorized under the 2000 Stock Incentive Plan and in
accordance with the Registration Statement, (b) duly authorized direct stock
issuances under the 2000 Stock Incentive Plan and in accordance with the
Registration Statement or (c) duly authorized stock purchase rights issued
under the Employee Stock Purchase Plan effected in accordance with the
Registration Statement, such Shares will be duly authorized, legally issued,
fully paid and nonassessable.

We consent to the filing of this opinion letter as Exhibit 5 to the
Registration Statement.

This opinion letter is rendered as of the date first written above and we
disclaim any obligation to advise you of facts, circumstances, events or
developments which hereafter may be brought to our attention and which may
alter, affect or modify the opinion expressed herein. Our opinion is
expressly limited to the matters set forth above and we render no opinion,
whether by implication or otherwise, as to any other matters relating to the
Company, the Plans or the Shares.


Very truly yours,

/S/ BROBECK, PHLEGER & HARRISON LLP

BROBECK, PHLEGER & HARRISON LLP