UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM SD

Specialized Disclosure Report

Lattice Semiconductor Corporation

(Exact name of registrant as specified in its charter)

5555 NE Moore Ct., Hillsboro, Oregon 97124

(Address of principal executive offices, including zip code)

Byron W. Milstead

Corporate Vice President, General Counsel & Secretary

(503) 268-8000

(Name and telephone number, including area code, of the person to contact in connection with this report.)

Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which the information in this form applies:

Section 1 - Conflict Minerals Disclosure

Item 1.01 Conflict Minerals Disclosure and Report

Lattice Semiconductor Corporation (together with its subsidiaries, “Lattice”) has evaluated its products for the year ending December 31, 2018 and determined that certain products that it contracted to manufacture contain conflict minerals that are necessary to the functionality of such products and that, after conducting a reasonable country of origin inquiry, Lattice is filing a Conflict Minerals Report.

A copy of Lattice Semiconductor Corporation’s Conflict Minerals Report is filed as Exhibit 1.01 hereto and is publicly available at http://www.latticesemi.com/About/Corpora teSocialResponsibility.

Item 1.02 Exhibit

Lattice Semiconductor Corporation has filed, as an exhibit to this Form SD, the Conflict Minerals Report required by Item 1.01.

Section 2 - Exhibits

Item 2.01 Exhibits

Exhibit 1.01 - Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

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 duly authorized undersigned.

Exhibit 1.01

Conflict Minerals Report

This Conflict Minerals Report for Lattice Semiconductor Corporation is prepared pursuant to Rule 13p-1 under the Securities Exchange Act of 1934 (“Rule 13p-1”) for the reporting period that ended December 31, 2018.

Lattice Semiconductor Corporation (collectively with its subsidiaries “Lattice,” “we,” or “our”) designs, develops and markets programmable logic and connectivity solutions. Lattice has adopted a Conflict Minerals Sourcing Policy that expresses our desire to have our products be “DRC Conflict Free,” meaning free from conflict minerals sourced from the Democratic Republic of the Congo and its adjoining countries (“Covered Countries”) that finance or benefit armed groups. Conflict minerals are tantalum, tungsten, tin and gold, and their derivatives.

Products and Initiatives

Based on our internal assessment, our semiconductor devices, evaluation boards, and development hardware that we contract to manufacture contain conflict minerals that are necessary to their functionality (the “3TG Products”). In order to seek a DRC Conflict Free supply chain and to comply with reporting requirements, we established processes designed to determine the source and chain of custody of conflict minerals in the 3TG Products. We have also adopted a Conflict Minerals Sourcing Policy and we require our suppliers to acknowledge and comply with this policy, which is available on the Corporate Social Responsibility page of our website at http://www.latticesemi.com/About/Corpora teSocialResponsibility.

Diligence Framework

Our due diligence strategy is consistent with the internationally recognized framework established by the Organisation for Economic Co-operation and Development Due Diligence Guidance for Responsible Supply Chains of Minerals from Conflict-Affected and High-Risk Areas, and related supplements. As part of our due diligence strategy, we established a company risk management system to support our ongoing efforts to identify, assess and respond to risks in our supply chain. Our company risk management system includes participation in industry-driven programs, including the adoption of the Responsible Business Alliance (the “RBA”) Code of Conduct and our support of the third-party audits and assessments conducted in connection with the Responsible Minerals Initiative (the “RMI”) Responsible Minerals Assurance Process, formerly known as the Conflict Free Smelter Program (the “RMAP”). Because we are at least several levels removed from the mining, refining and smelting of conflict minerals, our diligence measures can only provide a reasonable assurance regarding the source and chain of custody of conflict minerals in our supply chain. To determine the use and source of conflict minerals in our 3TG Products, we rely upon certifications from suppliers and upon the third-party assessments completed in connection with the RMAP.

As part of the RMAP, smelters are identified as “Conformant” if they have undergone an audit and are conformant with the RMAP assessment protocols. Smelters are identified as “Active” if they are participants in the RMAP and have committed to undergo an audit or are participating in another recognized certification program. These RMAP designations are an integral part of our risk management process because they provide us with independent third-party audits of the due diligence practices of the upstream smelters and refiners in our supply chain.

As part of our strategy, we conduct good faith reasonable country of origin inquiries and due diligence designed to determine whether any conflict minerals in our 3TG Products originated in the Covered Countries. We follow industry standards by requesting each supplier in our supply chain identify the processing facilities and other data related to conflict minerals in the 3TG Products using the latest version of the RMI Conflict Minerals Reporting Template (the “CMRT”). In order to determine the source and chain of custody of any conflict minerals in our supply chain, we communicate with the relevant suppliers in our supply chain, compile, validate and analyze the CMRT results, attempt to confirm reported results where appropriate, identify possible risks, work with our suppliers to mitigate those risks, and identify smelters and refiners certified by the RMI through the RMAP. If a supplier does not respond to our requests or provides an insufficient response, we engage in further discussions with that supplier to identify and assess risks. Our policy is to disengage with any supplier where we are concerned about conflict minerals sourced from the Covered Countries that finance or benefit armed groups, which may include suppliers from whom we did not receive a sufficient response after multiple inquiries. The results of our supply chain due diligence are reported regularly to Lattice management.

Due Diligence Results

In 2018, over 99% of our product related revenues originated from semiconductor devices, and all of our suppliers of semiconductor devices provided sufficient responses to our request. All but two of our suppliers of semiconductor devices provided certifications that their upstream smelters and refiners have been certified as Active or Conformant through the RMAP. We are working closely with those suppliers whose status has deviated from Active or Conformant to remedy the status, and will consider taking action to disengage from those suppliers in the event that such status cannot be remedied. Of the remaining fraction of suppliers of components used in our evaluation boards and development hardware, we request CMRT’s from these suppliers and work closely with them to obtain information regarding their sourcing of conflict minerals on an ongoing basis.

Based on the information provided by our suppliers and as result of our due diligence efforts for the period ended December 31, 2018, we believe that the conflict minerals contained in our 3TG Products originated from the facilities listed in Appendix I, as well as from recycled and scrap sources. Additional smelter and refinery information is contained within our CMRT, which is available on our website at http://www.latticesemi.com/About/Corporate SocialResponsibility.

This Conflict Minerals Report was not subject to an independent private sector audit.

Appendix I

The conflict minerals contained in our 3TG Products, to the extent known, are believed to have been sourced from recycled mat erials or the following countries: Austria, Australia, Belgium, Bolivia, Brazil, Canada, Chile, China, France, Germany, India, Indonesia, Italy, Japan, Kazakhstan, Kyrgyzstan, Republic of Korea, Malaysia, Mexico, Peru, Philippines, Poland, Russia, Singapore, South Africa, Spain, Sweden, Switzerland, Taiwan, Thailand, Turkey, United States, United Arab Emirates, Uzbekistan, Vietnam.