Exhibit 5.1


                        WORSHAM FORSYTHE WOOLDRIDGE LLP
                        Attorneys and Counselors at Law
                         1601 Bryan Street, 30th Floor
                              Dallas, Texas 75201
                                  __________

                           Telephone (214) 979-3000
                              Fax (214) 880-0011


                                 April 9, 2001


RF Monolithics, Inc.
4441 Sigma Road
Dallas, Texas 75244

Ladies and Gentlemen:

  In connection with the Registration Statement on Form S-8 to be filed by RF
Monolithics, Inc. ("Company") on or about the date hereof with the Securities
and Exchange Commission ("Commission") under the Securities Act of 1933, as
amended (the "Act"), for the registration of 500,000 shares of common stock,
$.001 par value per share ("Stock"), to be offered from time to time under the
Company's 1997 Equity Incentive Plan, as amended, and 1999 Equity Incentive
Plan, as amended (the "Plans"), we are of the opinion that any Stock to be
issued directly by the Company will be validly issued, fully paid and non-
assessable when such Stock shall have been issued and delivered as contemplated
in the Plans.

     The foregoing opinion is limited to the General Corporation Law of the
State of Delaware, and we express no opinion as to the laws of any other
jurisdiction.  We hereby consent to the filing of this opinion with the
Commission as an exhibit to the aforementioned Registration Statement.


                                    Very truly yours,

                                    WORSHAM FORSYTHE WOOLDRIDGE LLP


                                    By:  /s/ Timothy A. Mack.
                                       -----------------------------------
                                                                 A Partner