EXHIBIT 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statements (Form S-8 Nos. 333-132302, 333-122551, 333-112448, 333-103228, 333-81396, 333-33338, 333-51117, 333-06301 and 333-176052) pertaining to the 1993 Stock Option/Stock Issuance Plan of Ultratech, Inc.,

(2) Registration Statements (Form S-8 Nos. 333-83954 and 333-43952) pertaining to the Supplemental Stock Option/ Stock Issuance Plan of Ultratech, Inc.,

(3) Registration Statement (Form S-8 No. 333-93653) pertaining to the 1998 Supplemental Stock Option/ Stock Issuance Plan of Ultratech, Inc.,

(4) Registration Statement (Form S-8 No. 333-85161) pertaining to the 1993 Stock Option/ Stock Issuance Plan, 1998 Supplemental Stock Option/ Stock Issuance Plan, and Employee Stock Purchase Plan of Ultratech, Inc., and

(5) Registration Statement (Form S-8 No. 333-33197) pertaining to the 1993 Stock Option/ Stock Issuance Plan and Employee Stock Purchase Plan of Ultratech, Inc.;

of our reports dated March 1, 2017 with respect to the consolidated financial statements and schedule of Ultratech, Inc., and the effectiveness of internal control over financial reporting of Ultratech, Inc. included in this Annual Report (Form 10-K) of Ultratech, Inc. for the year ended December 31, 2016.

/s/ ERNST & YOUNG LLP

San Jose, California

March 1, 2017