EXHIBIT 5.1     
                                  
                               June 3, 1998     
   
Ladies and Gentlemen:     
   
  We have examined the Registration Statement on Form S-1 (File No. 333-49685)
originally filed by ISE Labs, Inc. (the "Company") with the Securities and
Exchange Commission (the "Commission") on April 8, 1998, as thereafter amended
or supplemented (the "Registration Statement"), in connection with the
registration under the Securities Act of 1933, as amended, of shares of the
Company's Common Stock (the "Shares"). The Shares include shares to be sold by
selling stockholders and the Company and an over-allotment option granted to
the Underwriters by the Company to purchase additional shares of the Company's
Common Stock. The Shares are to be sold to the Underwriters as described in
the Registration Statement for resale to the public. As your counsel in
connection with this transaction, we have examined the proceedings taken and
are familiar with the proceedings proposed to be taken by you in connection
with the sale and issuance of the Shares.     
   
  It is our opinion that, upon conclusion of the proceedings being taken or
contemplated by us, as your counsel, to be taken prior to the issuance of the
Shares and upon completion of the proceedings being taken in order to permit
such transactions to be carried out in accordance with the securities laws of
the various states where required, the Shares, when issued and sold in the
manner described in the Registration Statement, will be legally and validly
issued, fully paid and nonassessable.     
   
  We consent to the reference to our firm under the caption "Legal Matters" in
the Registration Statement and to the use of this opinion as an exhibit to the
Registration Statement and any amendment or supplement thereto.     
                                             
                                          Very Truly yours,     
                                             
                                          /s/ BROBECK, PHLEGER & HARRISON LLP
                                                 
                                          BROBECK, PHLEGER & HARRISON LLP