SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

November 14, 2005

Date of report (Date of earliest event reported)

ON Semiconductor Corporation

(Exact name of registrant as specified in its charter)

Delaware	000-30419	36-3840979
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification Number)

ON Semiconductor Corporation 5005 E. McDowell Road Phoenix, Arizona	85008
(Address of principal executive offices)	(Zip Code)

602-244-6600

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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Item 8.01. Other Events.

Attached to this Current Report as Exhibit 99.1 is a copy of a news release for ON Semiconductor Corporation dated November 14, 2005 titled “ON Semiconductor Updates Interest Expense Guidance after Successful Repayment of $66.4 Million of its 10 Percent Junior Subordinated Notes.”

Exhibit No.	Description
99	News release for ON Semiconductor Corporation dated November 14, 2005 titled “ON Semiconductor Updates Interest Expense Guidance after Successful Repayment of $66.4 Million of its 10 Percent Junior Subordinated Notes.”

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	ON SEMICONDUCTOR CORPORATION                         (Registrant)
Date: November 14, 2005	By:	/s/ DONALD A. COLVIN
		Donald A. Colvin Chief Financial Officer

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EXHIBIT INDEX

Exhibit No.	Description
99	News release for ON Semiconductor Corporation dated November 14, 2005 titled “ON Semiconductor Updates Interest Expense Guidance after Successful Repayment of $66.4 Million of its 10 Percent Junior Subordinated Notes.”

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