US ITC Issues Limited Exclusion Order on SiC/GaN Devices, Elevating Export Compliance Risks for Chinese Suppliers

On May 7, 2026, the U.S. International Trade Commission (ITC) issued a final determination in a Section 337 investigation concerning semiconductor devices, confirming that certain Chinese manufacturers—including Innoscience—infringed Infineon’s U.S. Patent No. 9,899,481. The ITC imposed a limited exclusion order and cease-and-desist order against their silicon carbide (SiC) and gallium nitride (GaN) power devices. This decision directly affects customs clearance for global importers, inventory management for distributors, and supply chain substitution decisions by OEMs—particularly in industrial power supplies, on-board chargers (OBCs) for electric vehicles, and photovoltaic inverters.

Final ITC Ruling on SiC/GaN Patent Infringement

On May 7, 2026, the U.S. International Trade Commission concluded its Section 337 investigation into semiconductor devices and determined that Innoscience and other Chinese entities violated Section 337 by infringing U.S. Patent No. 9,899,481 owned by Infineon Technologies AG. As a result, the ITC issued a limited exclusion order prohibiting the importation of infringing SiC and GaN power devices into the United States, along with a cease-and-desist order barring domestic sales and distribution of those products.

Impact Across the Semiconductor Supply Chain

Direct Exporters and Trading Firms

Companies engaged in direct export of SiC/GaN power devices to the U.S. now face immediate customs detention or rejection at port of entry. Compliance verification—including patent freedom-to-operate analysis—has become a prerequisite for shipment authorization, affecting documentation workflows, insurance coverage, and letter-of-credit terms.

Component Procurement Organizations

Firms sourcing raw wafers, epitaxial layers, or packaged die from affected Chinese suppliers must reassess bill-of-materials (BOM) traceability. Procurement contracts may require updated warranty clauses, indemnification language, and real-time IP status monitoring to mitigate downstream liability exposure.

Power Electronics Manufacturers

OEMs and contract manufacturers integrating SiC/GaN devices into end products—including industrial power systems, EV OBCs, and solar inverters—must evaluate redesign timelines, qualification testing requirements, and second-source validation. Product certification cycles (e.g., UL, CE, EN 62368-1) may be extended if component-level IP clearance is pending.

Supply Chain Service Providers

Distributors, logistics intermediaries, and customs brokers handling affected devices must update internal compliance protocols. Inventory audits, product classification reviews (HTS codes), and record retention practices are now subject to heightened scrutiny under U.S. enforcement expectations.

Key Compliance Priorities for Affected Enterprises

Patent Landscape Review and Freedom-to-Operate Assessment

Manufacturers and exporters should commission independent legal opinions on current and prospective U.S. patents covering SiC/GaN device structures, packaging methods, and control circuit integration—not limited to Patent No. 9,899,481—to inform design-around strategies and licensing negotiations.

Export Documentation and Customs Classification Rigor

U.S.-bound shipments require precise HTS code assignment (e.g., 8541.29 for discrete power semiconductors), accompanied by technical datasheets, application notes, and functional descriptions that clearly differentiate non-infringing features—especially in gate drive architecture, thermal interface design, and substrate material selection.

Supplier Qualification and Contractual Safeguards

Downstream buyers must revise supplier evaluation criteria to include documented IP diligence, indemnity commitments, and audit rights. Contracts should explicitly assign responsibility for Section 337-related losses and define escalation pathways for infringement claims.

Technical Documentation Readiness for Regulatory Scrutiny

Manufacturers should maintain up-to-date failure mode analyses, reliability test reports (e.g., JESD22-A108, A110), and comparative performance data against patented claims—readily available for potential ITC or CBP inquiries during entry review or post-import investigation.

Industry Perspective: Rising IP Barriers in Wide-Bandgap Power Semiconductors

Analysis shows that this ruling reflects a broader trend: patent enforcement in wide-bandgap (WBG) power electronics is shifting from litigation in district courts toward faster, more disruptive ITC proceedings. From an industry perspective, the convergence of high-value IP portfolios, mature fabrication ecosystems, and strategic enforcement timing suggests that similar actions targeting SiC/GaN devices—especially in high-growth applications like EV charging and renewable energy conversion—are increasingly likely. What deserves closer attention is how rapidly new entrants can adapt technical roadmaps to avoid entrenched IP while maintaining performance parity and cost competitiveness.

Toward Resilient, IP-Aware Power Device Sourcing

This ITC action does not prohibit all SiC/GaN exports from China—but it underscores that regulatory compliance in advanced semiconductor trade now requires proactive intellectual property governance, not just adherence to tariff classifications or safety standards. For global buyers and suppliers alike, building resilient supply chains means integrating patent intelligence into procurement planning, technical specification development, and long-term platform strategy—not treating IP as a peripheral legal concern.

Source Attribution and Verification Guidance

This article is based exclusively on the provided title, event date (May 7, 2026), and summary description. Specific official source links were not provided in the input and should be verified continuously. Stakeholders are advised to monitor updates from the U.S. International Trade Commission (ITC), the U.S. Court of Appeals for the Federal Circuit (CAFC), and official notices in the Federal Register. Continued observation is warranted for implementation guidance from U.S. Customs and Border Protection (CBP), evolving enforcement patterns in related investigations, and industry responses including cross-licensing developments or standard-setting initiatives addressing WBG device IP frameworks.