DCT

1:26-cv-00818

Wolfspeed Inc v. Navitas Semiconductor Corp

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Key Events
Amended Complaint
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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 1:26-cv-00818, D. Del., 09/18/2026
  • Venue Allegations: Venue is alleged to be proper in the District of Delaware as all defendant entities are incorporated or organized under the laws of the State of Delaware, and thus reside in the district.
  • Core Dispute: Plaintiff alleges that Defendant’s gallium nitride (GaN) and silicon carbide (SiC) based power semiconductor devices and modules infringe five patents related to semiconductor device structure, fabrication, and packaging.
  • Technical Context: The technology at issue involves wide bandgap semiconductors, which offer higher efficiency, temperature, and voltage operation compared to traditional silicon, making them critical for power electronics in electric vehicles, data centers, and renewable energy systems.
  • Key Procedural History: The complaint alleges that Plaintiff provided Defendant with pre-suit notice of infringement. This includes a letter dated April 10, 2026, and a subsequent letter on May 11, 2026, that allegedly included claim charts mapping asserted claims to accused products. This correspondence may be central to allegations of willful infringement.

Case Timeline

Date Event
2009-12-11 ’005 Patent Priority Date
2012-05-01 ’005 Patent Issue Date
2012-12-28 ’396 Patent Priority Date
2015-03-16 ’392 Patent Priority Date
2017-01-13 ’443 Patent Priority Date
2018-10-01 ’396 Patent Filing Date
2019-02-04 ’443 Patent Filing Date
2019-05-16 ’418 Patent Priority Date
2020-04-17 ’392 Patent Filing Date
2020-08-18 ’443 Patent Issue Date
2021-01-05 ’396 Patent Issue Date
2021-05-04 ’418 Patent Issue Date
2024-01-30 ’392 Patent Issue Date
2026-04-10 Plaintiff sends first notice letter to Defendant
2026-04-23 Defendant acknowledges receipt of Plaintiff's letter
2026-05-11 Plaintiff sends second notice letter with claim charts
2026-09-18 Complaint Filing Date

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 10,749,443 - High Power Multilayer Module Having Low Inductance and Fast Switching for Paralleling Power Devices

The Invention Explained

  • Problem Addressed: The background of the patent describes how parasitic impedances, particularly loop inductance, in conventional power modules can cause voltage overshoots and ringing during high-speed switching, which limits performance and can stress components ’443 Patent, col. 1:38-49
  • The Patented Solution: The invention is a power module structure designed to minimize inductance by using a multi-level layout with "terraced" power terminals at different elevations ’443 Patent, col. 13:51-64 This arrangement allows external connections, such as laminated bus bars, to be placed in close proximity with opposing current flows, which facilitates flux cancellation and reduces overall loop inductance ’443 Patent, col. 14:1-10 ’443 Patent, FIG. 15
  • Technical Importance: This packaging approach enables the use of fast-switching wide bandgap devices (e.g., SiC) in parallel, allowing for higher current handling and power density than was achievable with standard packaging ’443 Patent, col. 5:1-7

Key Claims at a Glance

  • The complaint asserts at least one claim without specifying which Compl. ¶41 Independent claim 1 is representative of the core invention.
  • Key elements of independent claim 1 include:
    • at least one power substrate;
    • a housing arranged on the power substrate;
    • a first terminal with a contact surface located above the housing at a first elevation;
    • a second terminal with a contact surface located above the housing at a second elevation different from the first elevation;
    • a third terminal; and
    • a plurality of power devices electrically connected to the power substrate.
  • The complaint does not explicitly reserve the right to assert dependent claims but refers generally to "at least one or more claims" Compl. ¶41

U.S. Patent No. 11,888,392 - High Speed, Efficient SiC Power Module

The Invention Explained

  • Problem Addressed: The patent addresses the challenge of creating power converter modules that can operate at high switching frequencies and power densities, which requires superior thermal dissipation without compromising structural integrity ’392 Patent, col. 1:29-47
  • The Patented Solution: The patent discloses a power converter module that is "devoid of a baseplate" and instead uses an Active Metal Braze (AMB) substrate with an aluminum nitride base layer ’392 Patent, abstract This construction provides a strong, direct thermal path away from the SiC switching components, improving heat dissipation while maintaining structural integrity without the need for a traditional, bulky baseplate ’392 Patent, col. 2:45-51
  • Technical Importance: By eliminating the conventional baseplate, the module can achieve higher power density and thermal efficiency, which is critical for compact, high-performance power converters using SiC technology ’392 Patent, col. 8:5-15

Key Claims at a Glance

  • The complaint asserts at least one claim without specifying which Compl. ¶48 Independent claim 1 is representative.

  • Key elements of independent claim 1 include:

    • a housing;
    • a substrate within the housing, comprising a base layer and a conductive layer;
    • power converter circuitry on the substrate with at least two silicon carbide switching components; and
    • a negative limitation: "wherein the power converter module is devoid of a baseplate."

  • The complaint refers generally to "at least one or more claims" Compl. ¶48

  • Multi-Patent Capsule: U.S. Patent No. 8,169,005

    • Patent Identification: U.S. Patent No. 8,169,005, High Voltage GaN Transistors, issued May 1, 2012.
    • Technology Synopsis: The patent discloses a Gallium Nitride (GaN) transistor architecture that uses multiple, specifically arranged field plates and spacer layers to manage electric fields within the device ’005 Patent, abstract This design aims to achieve a high breakdown voltage while maintaining low on-resistance, enhancing the transistor's performance in high-power, high-frequency switching applications Compl. ¶25
    • Asserted Claims: At least one or more claims Compl. ¶55
    • Accused Features: The complaint accuses Navitas's GaN-based products, including GaNFast®, GaNSlim™, GaNSafe®, and GaN FET products Compl. ¶55

  • Multi-Patent Capsule: U.S. Patent No. 10,998,418

    • Patent Identification: U.S. Patent No. 10,998,418, Power Semiconductor Devices Having Reflowed Inter-Metal Dielectric Layers, issued May 4, 2021.
    • Technology Synopsis: This patent describes a method for fabricating semiconductor devices using a multi-layer inter-metal dielectric (IMD) structure that combines a non-reflowable material with a reflowed material (e.g., BPSG glass) ’418 Patent, abstract The reflow process creates a rounded, smoother topography, which improves the coverage and integrity of subsequent metal layers, thereby enhancing device reliability and performance, particularly in SiC MOSFETs Compl. ¶28
    • Asserted Claims: At least one or more claims Compl. ¶61
    • Accused Features: The complaint accuses Navitas's GeneSiC™ MOSFET products and the SiCPAK™ Module products that incorporate those MOSFETs Compl. ¶61

  • Multi-Patent Capsule: U.S. Patent No. 10,886,396

    • Patent Identification: U.S. Patent No. 10,886,396, Transistor Structures Having a Deep Recessed P+ Junction and Methods for Making Same, issued January 5, 2021.
    • Technology Synopsis: The invention relates to a transistor structure, such as a SiC MOSFET, that incorporates a "deep recessed P+ junction" below the source region ’396 Patent, abstract This structural modification is intended to reduce the peak electric field at the gate oxide interface, which can improve device reliability and reduce leakage current during high-voltage blocking operations Compl. ¶31 ’396 Patent, col. 2:49-65
    • Asserted Claims: At least one or more claims Compl. ¶68
    • Accused Features: The complaint accuses Navitas's GeneSiC™ MOSFET products and the SiCPAK™ Module products that incorporate those MOSFETs Compl. ¶68

III. The Accused Instrumentality

Product Identification

The complaint collectively identifies the "Accused Products" as Navitas's GaN-based and SiC-based power semiconductor devices Compl. ¶33 Specific product families named include:

  • GaN-based: GaNFast® (e.g., models NV6115, NV6512C), GaNSlim™, GaNSafe®, and GaN FET products Compl. ¶33
  • SiC-based: GeneSiC™ MOSFET products (e.g., G3F18MT12K) and SiCPAK™ Module products (e.g., G3F09MT12FB2) Compl. ¶33

Functionality and Market Context

  • The Accused Products are wide bandgap power semiconductors and modules used for power conversion in applications requiring high temperature, high voltage, and high frequency operation Compl. ¶13
  • Plaintiff alleges these products are used in defense, AI data centers, motor drives, power supplies, and transportation applications Compl. ¶14
  • The complaint alleges Defendant markets, sells, and distributes these products throughout the United States via its website and third-party distributors Compl. ¶¶34-35

IV. Analysis of Infringement Allegations

The complaint alleges infringement of each patent and states that preliminary claim charts are attached as exhibits Compl. ¶¶42, 49, 56, 62, 69 As these exhibits were not provided, this analysis summarizes the narrative infringement theory. No probative visual evidence provided in complaint.

  • '443 Patent Infringement Allegations: The complaint alleges that Navitas's SiCPAK™ Module products (such as the G3F09MT12FB2, SiCPAK™ G modules, and SiCPAK™ F modules) directly infringe one or more claims of the ’443 Patent Compl. ¶41 The complaint incorporates by reference an unprovided claim chart (Exhibit 6) that purportedly maps features of these products to the limitations of asserted claims Compl. ¶42
  • '392 Patent Infringement Allegations: The complaint alleges that the same SiCPAK™ Module products also directly infringe one or more claims of the ’392 Patent Compl. ¶48 The infringement theory is detailed in an unprovided claim chart (Exhibit 7) that is incorporated by reference Compl. ¶49
  • Identified Points of Contention:
    • Scope Questions: For the ’443 Patent, a potential point of contention is whether the terminals of the accused SiCPAK™ modules possess contact surfaces at "different elevations" as required by claim 1. The construction of this term, and the evidence of the physical structure of the accused modules, will be critical. For the ’392 Patent, a central issue may be the negative limitation "devoid of a baseplate." The analysis will question whether the accused modules, which are designed for thermal management, contain a structure that could be construed as a "baseplate" under the patent's definition.
    • Technical Questions: A key technical question for the ’392 Patent is whether the substrate used in the accused SiCPAK™ modules qualifies as an "active metal braze (AMB) substrate" with an "aluminum nitride base layer" as described in the patent ’392 Patent, abstract This will require technical evidence comparing the materials and construction of the accused products to the teachings of the specification.

V. Key Claim Terms for Construction

  • For the '443 Patent:

    • The Term: "a second elevation different from the first elevation" (from claim 1).
    • Context and Importance: This term defines the core "terraced" or multi-level structure of the claimed power module, which is central to achieving low inductance. Infringement will depend on whether the accused modules have terminal contact surfaces at physically distinct and functionally significant different heights.
    • Intrinsic Evidence for Interpretation:
      • Evidence for a Broader Interpretation: The claim language itself is broad, requiring only that the elevations be "different." The summary of the disclosure also uses this general language, suggesting any measurable height difference could suffice ’443 Patent, col. 2:60-63
      • Evidence for a Narrower Interpretation: The specification explicitly links the height difference to a functional purpose: accommodating an external bus bar without bends. Figure 15 and the accompanying text describe an offset distance (702) that "may be adjusted to match the thickness of the buss bar metal" ’443 Patent, col. 14:25-28 A party could argue this ties the "different elevation" to a specific, functional height difference required for this bus bar interface.

  • For the '392 Patent:

    • The Term: "devoid of a baseplate" (from claim 1).
    • Context and Importance: This negative limitation is fundamental to the claimed invention, which aims to improve thermal performance by eliminating a traditional component. The entire infringement question for this patent may hinge on the definition of "baseplate."
    • Intrinsic Evidence for Interpretation:
      • Evidence for a Broader Interpretation: The patent does not provide an explicit definition of "baseplate." A party could argue it refers to any module that does not have a separate, physically distinct, and typically metallic plate attached to the bottom of the substrate for structural support and heat spreading, a common feature in conventional modules the patent seeks to improve upon.
      • Evidence for a Narrower Interpretation: The abstract states the invention uses an "AMB substrate with an aluminum nitride base layer" to achieve its goals ’392 Patent, abstract A defendant might argue that the "base layer" of the substrate itself functions as a baseplate, or that the term "devoid of" requires the complete absence of any dedicated structural or primary thermal-spreading layer at the bottom of the module stack.

VI. Other Allegations

  • Indirect Infringement: The complaint alleges inducement of infringement for all five asserted patents. The basis for this allegation is Defendant’s marketing, sale, and provision of "instructions, user manuals, application notes, technical documentation, advertising, and marketing materials that facilitate, direct, and encourage the use of the Accused Products" by customers and end users Compl. ¶¶43, 50, 57, 63, 70
  • Willful Infringement: Willfulness is alleged for all five asserted patents. The complaint bases this on Defendant’s alleged actual knowledge of the patents and their infringement prior to the lawsuit, stemming from notice letters sent by Plaintiff’s counsel on April 10, 2026, and May 11, 2026 Compl. ¶¶37-39 Compl. ¶44 Compl. ¶51 Compl. ¶58 Compl. ¶64 Compl. ¶71

VII. Analyst’s Conclusion: Key Questions for the Case

  1. A central issue will be one of definitional scope: Can the structural claims of the packaging patents (’443 and ’392) be read to cover the accused SiCPAK™ modules? This will turn on the court's construction of key terms such as "different elevation" and the negative limitation "devoid of a baseplate," which will likely require a deep dive into the patent specifications and the state of the art at the time of invention.
  2. A key evidentiary question will be one of structural identity: For the device-level patents (’005, ’418, and ’396), the case will depend on detailed technical evidence from reverse engineering or discovery. The core question is whether Navitas's GaN and SiC devices contain the specific field plate arrangements, multi-layer dielectric patterns, and recessed P+ junctions required by the respective claims.
  3. A significant dispute will likely concern willfulness and damages: The complaint’s specific allegations of pre-suit notice, including the provision of claim charts, establishes a clear timeline for Defendant’s alleged knowledge. A key question for the court will be whether Defendant’s actions after receiving this notice were objectively reckless, which would expose it to the risk of enhanced damages.