US BIS Expands Export Controls on SiC/GaN Power Devices

On May 6, 2026, the U.S. Department of Commerce’s Bureau of Industry and Security (BIS) added 12 categories of high-voltage silicon carbide (SiC) MOSFETs and gallium nitride (GaN) HEMTs — specifically those rated at 750V+ (for EV motor controls, 6G base station power supplies, and LiDAR drivers) and 650V+ respectively — to Export Control Classification Number (ECCN) 3A001.b.3 under Supplement No. 4 to Part 774 of the Export Administration Regulations (EAR). The revision introduces new licensing requirements for exports to China, directly affecting supply chain participation by Chinese foundries such as China Resources Microelectronics and Telink Semiconductor in tier-two roles for U.S.-based automotive and telecom equipment manufacturers.

Event Overview

The U.S. Bureau of Industry and Security (BIS) published EAR Supplement No. 4 to Part 774 on May 6, 2026. This regulatory amendment expands the list of controlled items under ECCN 3A001.b.3 to include 12 specific types of SiC MOSFETs (750V+) and GaN HEMTs (650V+) used in electric vehicle (EV) power control units, 6G base station power systems, and LiDAR driver modules. Exports of these items to China now require a BIS license. The rule is effective as of the publication date, and no transitional provisions or grandfathering clauses have been publicly disclosed.

Impact on Specific Industry Segments

Direct Trade Enterprises

Companies engaged in cross-border export or re-export of discrete SiC/GaN power devices to China — including U.S.-based distributors and logistics intermediaries — are now subject to mandatory license applications. Delays in license review may extend order fulfillment timelines by 8–12 weeks, particularly for shipments involving dual-use end users or unspecified end-use declarations.

Foundry & Contract Manufacturing Firms

Chinese semiconductor foundries supplying SiC/GaN power devices to U.S. OEMs (e.g., for EV inverters or 6G infrastructure) face revised compliance obligations. As tier-two suppliers, they must now verify end-user legitimacy, document technical specifications against the newly listed categories, and ensure internal export classification aligns with ECCN 3A001.b.3 — even when shipping through non-U.S. entities.

Downstream System Integrators & Equipment Makers

OEMs and ODMs in China that integrate these components into EV traction inverters, 6G radio units, or automotive LiDAR subsystems may encounter upstream supply shortages or contractual renegotiations. Since the regulation targets device-level parameters (voltage rating, structure, application), system-level exemptions do not apply unless explicitly confirmed by BIS guidance.

What Relevant Enterprises or Practitioners Should Focus On and How to Respond

Monitor official updates and interpretive guidance from BIS

Analysis shows that BIS has not yet issued FAQs, advisory notes, or enforcement clarifications regarding this revision. Stakeholders should track the Federal Register docket and BIS’s public notices for potential amendments, licensing policy statements, or case-specific determinations.

Verify device-level classification against the 12 newly listed categories

Observably, the restriction applies only to specified voltage thresholds and application contexts (EV control, 6G power, LiDAR drive). Firms must cross-check product datasheets, test reports, and application documentation — not just part numbers — to determine whether their offerings fall within the scope of ECCN 3A001.b.3.

Distinguish between regulatory signal and operational impact

From an industry perspective, this revision reflects tightening control over critical power electronics enabling strategic technologies — but it does not constitute a blanket ban. License exceptions (e.g., ENC, TSU) remain potentially applicable depending on end use, end user, and encryption status; however, none have been confirmed for these specific items in current public guidance.

Prepare documentation and communication protocols for affected supply tiers

Current best practice includes updating internal export compliance checklists, revising supplier questionnaires to capture BIS-relevant technical attributes, and initiating proactive dialogue with U.S. customers regarding updated end-user statements and delivery timelines — especially where existing contracts lack export-control contingency clauses.

Editorial Perspective / Industry Observation

This action is better understood as a targeted escalation in technology-specific controls rather than a broad-based trade restriction. Analysis shows that BIS continues to refine its approach by focusing on performance parameters (voltage class, material system, application domain) rather than generic technology categories. Observably, the inclusion of 6G and LiDAR — both emerging infrastructure domains — signals heightened attention to power semiconductors as foundational enablers of next-generation connectivity and autonomy. From an industry standpoint, this revision underscores that export compliance is no longer solely a customs or legal function, but a design- and procurement-integrated requirement for power device developers and integrators alike.

Conclusion

This regulatory update marks a formalization of export controls targeting high-performance SiC and GaN power devices in strategically sensitive applications. It does not eliminate trade, but raises the compliance burden and lead-time uncertainty for affected participants across the global power semiconductor value chain. Current interpretation favors treating it as an operational adjustment point — requiring precise technical classification, proactive documentation, and ongoing policy monitoring — rather than an immediate market exit signal.

Information Source

Main source: U.S. Department of Commerce, Bureau of Industry and Security (BIS), Export Administration Regulations (EAR), Supplement No. 4 to Part 774, published May 6, 2026. Pending observation: BIS licensing processing times, applicability of license exceptions, and potential future revisions to the list of controlled items.