EX-4.3(C)





 Exhibit 4.3(c) 

ON SEMICONDUCTOR CORPORATION 
 and

 THE GUARANTORS NAMED HEREIN 

1.625% CONVERTIBLE SENIOR NOTES DUE 2023 

FIRST SUPPLEMENTAL INDENTURE 
 AND
AMENDMENT – GUARANTEE 
 DATED AS OF JANUARY 7, 2020 

WELLS FARGO BANK, NATIONAL ASSOCIATION, 

Trustee 












 This FIRST SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of January 7,
2020, is among ON Semiconductor Corporation, a Delaware corporation (the “Company”), ON Semiconductor Connectivity Solutions, Inc., a Delaware corporation (the “Guarantor”), and Wells Fargo Bank, National Association, a national
banking association, as Trustee. 
 RECITALS 

WHEREAS, the Company, the initial Guarantors and the Trustee entered into an Indenture, dated as of March 31, 2017 (the “Indenture”), pursuant
to which the Company has issued $575,000,000 in principal amount of 1.625% Convertible Senior Notes due 2023 (the “Notes”); and 
 WHEREAS,
Section 10.01(c) of the Indenture provides that the Company, the Guarantors and the Trustee may amend or supplement the Indenture in order to add Guarantors with respect to the Notes, without the consent of the Holders; and 

WHEREAS, all acts and things prescribed by the Indenture, by law and by the Certificate of Incorporation and the Bylaws (or comparable constituent documents)
of the Company, of the Guarantors and of the Trustee necessary to make this Supplemental Indenture a valid instrument legally binding on the Company, the Guarantors and the Trustee, in accordance with its terms, have been duly done and performed;

 NOW, THEREFORE, to comply with the provisions of the Indenture and in consideration of the above premises, the Company, the Guarantors and the Trustee
covenant and agree for the equal and proportionate benefit of the respective Holders as follows: 
 ARTICLE 1 

Section 1.01 This Supplemental Indenture is supplemental to the Indenture and does and shall be deemed to form a part of, and shall be construed in
connection with and as part of, the Indenture for any and all purposes. 
 Section 1.02 This Supplemental Indenture shall become effective immediately
upon its execution and delivery by each of the Company, the Guarantor and the Trustee. 
 ARTICLE 2 

From this date, by executing this Supplemental Indenture, the Guarantor whose signature appears below shall be a Guarantor with respect to the Notes on terms
contemplated by and subject to the provisions of Article 13 of the Indenture. 
 ARTICLE 3 

Section 3.01 Except as specifically modified herein, the Indenture and the Notes are in all respects ratified and confirmed (mutatis mutandis) and shall
remain in full force and effect in accordance with their terms with all capitalized terms used herein without definition having the same respective meanings ascribed to them as in the Indenture. 

Section 3.02 Except as otherwise expressly provided herein, no duties, responsibilities or liabilities are assumed, or shall be construed to be assumed,
by the Trustee by reason of this Supplemental Indenture. This Supplemental Indenture is executed and accepted by the Trustee subject to all the terms and conditions set forth in the Indenture with the same force and effect as if those terms and
conditions were repeated at length herein and made applicable to the Trustee with respect hereto. 
 Section 3.03 THIS SUPPLEMENTAL INDENTURE SHALL BE
GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 
 Section 3.04 The parties may sign any number of copies of this
Supplemental Indenture. Each signed copy shall be an original, but all of such executed copies together shall represent the same agreement. 

[NEXT PAGE IS SIGNATURE PAGE] 












 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed, all as
of the date first written above. 
  

			
	ON SEMICONDUCTOR CORPORATION
		
	By	 	 /s/ Keith D. Jackson

	Name:  	 	Keith D. Jackson
	Title:	 	President and Chief Executive Officer
	
	ON SEMICONDUCTOR CONNECTIVITY SOLUTIONS, INC.
		
	By	 	 /s/ George H. Cave

	Name:	 	George H. Cave
	Title:	 	Secretary
	
	WELLS FARGO BANK, NATIONAL ASSOCIATION, AS TRUSTEE
		
	By	 	 /s/ Michael Q. Tu

	Name:	 	Michael Q. Tu
	Title:	 	Vice President


 Signature page to First Supplemental Indenture to 1.625% Notes Indenture