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JOINDER AGREEMENT THIS JOINDER AGREEMENT (the “Agreement”), dated as of August
22, 2018, is by and between (i) each of REACTION TECHNOLOGY EPI, LLC, a Delaware
limited liability company, and REACTION TECH RE, LLC, a Delaware limited
liability company (each, a “Subsidiary”), and (ii) BANK OF AMERICA, N.A., in its
capacity as Agent under that certain Credit Agreement (as it may be amended,
modified, restated or supplemented from time to time, the “Credit Agreement”),
dated as of March 4, 2016, by and among Littelfuse, Inc., a Delaware
corporation, the Designated Borrowers, the Guarantors, the Lenders, and Bank of
America, N.A., as Agent. All of the defined terms in the Credit Agreement are
incorporated herein by reference. The Loan Parties are required by Section 6.12
of the Credit Agreement to cause each Subsidiary to become a “Guarantor”.
Accordingly, each Subsidiary hereby agrees as follows with the Agent, for the
benefit of the Lenders: 1. The Subsidiary hereby acknowledges, agrees and
confirms that, by its execution of this Agreement, the Subsidiary will be deemed
to be a party to the Credit Agreement and a “Guarantor” for all purposes of the
Credit Agreement, and shall have all of the obligations of a Guarantor
thereunder as if it had executed the Credit Agreement. The Subsidiary hereby
ratifies, as of the date hereof, and agrees to be bound by, all of the terms,
provisions and conditions applicable to the Guarantors contained in the Credit
Agreement. Without limiting the generality of the foregoing terms of this
paragraph 1, the Subsidiary hereby jointly and severally together with the other
Guarantors, guarantees to each Lender and the Agent, as provided in Article XI
of the Credit Agreement, the prompt payment of the Obligations in full when due
(whether at stated maturity, as a mandatory prepayment, by acceleration, a
mandatory cash collateralization or otherwise) strictly in accordance with the
terms thereof. 2. The address of the Subsidiary for purposes of all notices and
other communications is c/o Littelfuse, Inc., 8755 W. Higgins Road, Chicago,
Illinois 60631, Attention: Assistant Treasurer (Facsimile No. 847-512-0340). 3.
The Subsidiary hereby waives acceptance by the Agent and the Lenders of the
guaranty by the Subsidiary under Article XI of the Credit Agreement upon the
execution of this Agreement by the Subsidiary. 4. This Agreement may be executed
in two or more counterparts, each of which shall constitute an original but all
of which when taken together shall constitute one contract. 5. This Agreement
shall be governed by and construed and interpreted in accordance with the laws
of the State of New York. [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

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Schedule 1 TO JOINDER AGREEMENT Subsidiary Chief Executive Tax Organization
Chief Place of Office Identification Identification Business of Number Number
Subsidiary Reaction Technology 8755 W. Higgins 83-1336637 6985502 8755 W. Epi,
LLC (DE) Road, Chicago, Higgins Road, Illinois 60631 Chicago, Illinois 60631
Reaction Tech RE, 8755 W. Higgins 83-1318425 6985506 8755 W. LLC (DE) Road,
Chicago, Higgins Road, Illinois 60631 Chicago, Illinois 60631

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