SiC Power Semiconductors Patent Landscape 2026
SiC Power Semiconductors Patent Landscape in 2026
The SiC power semiconductor patent field is mature and moderately concentrated, with Wolfspeed holding a commanding lead and Japanese incumbents filling the next tier. Annual volume peaked in 2022 and has since plateaued, signalling a field consolidating around device architecture and process refinement rather than foundational discovery.
Wolfspeed leads a field dominated by US and Japanese incumbents
Wolfspeed is the clear ranking leader, with Sumitomo Electric Industries, ROHM, Mitsubishi Electric, and Fuji Electric occupying a tightly grouped second tier. The top five filers account for 30% of the combined output of the hundred largest filers — a meaningful but not extreme concentration level.
Below the top five, the field broadens across a mix of Japanese device makers, US defence and industrial incumbents, and a smaller cohort of European and Chinese entrants. The tier gap between Wolfspeed and the second-ranked applicant is substantial, reflecting Wolfspeed’s origins as the pioneer of commercial SiC substrates and epitaxial wafers.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Wolfspeed Inc | 2,353 | |
| 2 | Sumitomo Electric Industries Ltd | 1,200 | |
| 3 | ROHM Co Ltd | 1,151 | |
| 4 | Mitsubishi Electric Corp | 1,043 | |
| 5 | Fuji Electric Co Ltd | 868 | |
| 6 | Toshiba Corporation | 867 | |
| 7 | Fujitsu Ltd | 710 | |
| 8 | Denso Corp | 636 | |
| 9 | Panasonic Holdings Corp | 627 | |
| 10 | General Electric Co | 494 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Infineon Technologies AG | 448 | |
| 12 | Samsung Electronics Co Ltd | 419 | |
| 13 | Taiwan Semiconductor Manufacturing Co Ltd | 355 | |
| 14 | Motorola Inc | 295 | |
| 15 | Hitachi Ltd | 295 | |
| 16 | Semicon Energy Lab Co Ltd | 288 | |
| 17 | Renesas Electronics Corp | 277 | |
| 18 | Resonac Corp | 262 | |
| 19 | Semicon Components Industries LLC | 261 | |
| 20 | Hitachi Energy Ltd | 254 |
The positions of incumbents imply that IP portfolios in core device structures (H01L 29) are heavily occupied. New entrants seeking freedom to operate will need to differentiate at the system integration, packaging, or novel process layer.
Filing counts for 2024 and 2025 are subject to publication lag and should be read as partial; the apparent dip in those years does not necessarily indicate a structural decline. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Peak activity in 2022; device-level IP dominates but adjacent branches remain active
The annual filing trend reveals a field that built steadily from 2017 through a 2022 peak and has since plateaued. The technology composition chart shows H01L semiconductor device classes accounting for the vast majority of filings, with secondary clusters in power conversion, crystal growth, and coating processes.
Annual filing trend
Filings rose from 967 in 2017 to a peak of 1,161 in 2022, then eased to 1,035 in 2023. Counts for 2024 and 2025 are substantially under-reported due to typical 18–24 month publication lag and should not be read as reflecting true activity levels.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01L semiconductor device classes dominate the composition, reflecting deep investment in SiC transistor, diode, and MOSFET structures. H02M power conversion, C30B crystal growth, and C23C surface deposition form a meaningful secondary layer, indicating that upstream material science and downstream power-circuit integration are active but less contested than core device IP.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Method for manufacturing a silicon carbide power d…
The disclosure relates to a method for manufacturing a Silicon Carbide power device on a Silicon Carbide device wafer and an SiC power device obtainable by such method. The method comprises: slicing (101) a Silicon Carbide device wafer from a Silicon Carbide boule; providing (102) a carrier wafer; bonding (103) the backside of the Silicon Carbide device… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Nitride based transistors on semi-insulating silic… | 885 |
| 2 | Group III nitride photonic devices on silicon carb… | 885 |
| 3 | Method for manufacturing a semiconductor substrate | 773 |
| 4 | Group III nitride photonic devices on silicon carb… | 764 |
| 5 | Light emitting diodes including modifications for … | 762 |
| 6 | Pendeoepitaxial gallium nitride semiconductor laye… | 755 |
| 7 | Integrated heterostructures of group III-V nitride… | 746 |
| 8 | Wafer bonding of light emitting diode layers | 682 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the IP structure means for R&D investment decisions
The combination of a mature lifecycle, high device-level concentration, active cross-corporate collaboration, and US-led jurisdictional coverage shapes where new entrants and challengers can realistically compete.
Field is mature; incremental device refinement now dominates
The lifecycle stage is Maturity: annual filings peaked in 2022 and have plateaued near that level, with the multi-year window still slightly positive. Core SiC MOSFET and Schottky diode architectures are heavily patented, shifting competitive differentiation toward packaging, reliability, and system-level integration. R&D investment in foundational device structures faces the highest freedom-to-operate risk.
Lifecycle: MatureModerate top-tier concentration; broad mid-tier offers entry points
The top five filers hold 30% of the hundred largest filers’ combined output, with Wolfspeed alone accounting for a disproportionate share. The mid-tier — spanning Japanese device makers, European power specialists such as Infineon, and emerging Chinese university filers — is fragmented enough that a focused portfolio in an adjacent technical area can achieve meaningful ranking. Challengers should map claim scope in H01L 29 subclasses before committing to core device routes.
Concentration: ModerateCo-filing clusters around parent–subsidiary and public–private pairs
The most active co-filing pair is Toshiba and Toshiba Electronic Components & Storage (36 joint filings), followed by Fuji Electric with Japan’s National Institute of Advanced Industrial Science and Technology (26), and ROHM with Nissan Motor (18). Wolfspeed and Cree Microwave have co-filed on 16 records, reflecting the corporate lineage between those entities. These clusters reveal that cross-sector partnerships — particularly device maker plus automotive OEM — are an established strategy for accelerating SiC adoption in traction applications.
Collaboration: ActiveUS is the dominant filing jurisdiction; China and EPO are secondary
The United States is the primary filing jurisdiction by a wide margin, followed by Europe (EPO) and WIPO PCT routes. China ranks fourth, notably below its share in many adjacent semiconductor fields, which may reflect both IP strategy choices by incumbents and the earlier stage of domestic Chinese SiC IP development. Japan shows a relatively low direct-filing count despite Japanese firms’ strong overall rankings, suggesting many Japanese applicants route through the US and PCT rather than filing domestically first.
Geography: US-ledGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Toshiba Corporation | Toshiba Electronic Devices & Storage Corporation | 36 |
| Fuji Electric Co Ltd | National Institute of Advanced Industrial Science and Technology (AIST) | 26 |
| ROHM Co Ltd | Nissan Motor Co Ltd | 18 |
| Wolfspeed Inc | Cree Microwave LLC | 16 |
| Mitsubishi Electric Corp | Mitsubishi Electric R&D Centre Europe | 14 |
| Sumitomo Electric Industries Ltd | SCIO | 11 |
| Sumitomo Electric Industries Ltd | Mitsubishi Corporation | 11 |
| Fujitsu Ltd | Fujitsu Semiconductor Ltd | 11 |
| ROHM Co Ltd | Mazda Motor Corporation | 10 |
| Fujitsu Ltd | Hitachi Cable Ltd | 10 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Wolfspeed commands device IP; Japanese challengers compete on process and packaging
Wolfspeed’s portfolio is concentrated squarely in semiconductor device structures across H01L 29 and H01L 21 subclasses. The leading Japanese challengers — Sumitomo Electric, ROHM, and Mitsubishi Electric — share a similar device-first focus but add meaningful crystal-growth and packaging coverage, positioning them as vertically integrated alternatives.
Wolfspeed Inc
Wolfspeed leads with 2,353 patent records, concentrated in H01L 29 semiconductor device structures (1,323 records) and H01L 21 fabrication processes (1,139 records). Momentum has eased — recent filings are down 11% versus the prior period — consistent with a field-wide plateauing rather than a strategic retreat. Its scale advantage in substrate and epitaxy IP creates a significant barrier for device-only entrants.
patent records: 2,353Sumitomo Electric Industries Ltd
Sumitomo Electric ranks second with 1,200 patent records and is one of the few top-tier filers showing positive momentum — up 10% in recent filings. Its portfolio balances H01L 21 fabrication (646 records) and H01L 29 device structures (642 records) with a notable C30B crystal-growth component (147 records), reflecting its upstream SiC wafer supply position. This upstream–device combination makes it a strategically distinct challenger to Wolfspeed.
patent records: 1,200| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Wolfspeed Inc | 179 | ▼ -11% |
| Sumitomo Electric Industries Ltd | 43 | ▲ +10% |
| ROHM Co Ltd | 177 | ▼ -14% |
| Toshiba Corporation | 38 | ▼ -42% |
| Fujitsu Ltd | 12 | ▼ -67% |
| Mitsubishi Electric Corp | 46 | ▼ -60% |
| Fuji Electric Co Ltd | 50 | ▼ -18% |
| Panasonic Holdings Corp | 5 | ▼ -58% |
Under-served branches adjacent to the core device cluster
Several IPC branches appear at materially lower share than the dominant H01L device class. These represent relative sparsity observations; where technical relevance and an entry path exist, they may warrant closer investigation.
H02M · Power conversion circuits
Power conversion (H02M) accounts for 7% of the branch distribution — the largest share outside the core semiconductor device classes — yet remains under-represented relative to the commercial importance of SiC-based inverters and converters in EV and grid applications. The branch is not uncontested: General Electric has an H02M 7 presence. However, the gap between device-level IP density and circuit-level IP density suggests room for applicants who can combine SiC device expertise with switching topology and gate-driver innovation. Entry is most plausible for firms already active in power electronics system design.
Search this in Eureka →C30B · Crystal growth
Crystal growth (C30B) holds 6% of the branch distribution, primarily accessed by substrate specialists such as Sumitomo Electric and Motorola’s legacy portfolio. SiC boule growth, epitaxial layer quality, and defect reduction remain active engineering challenges that directly limit device yield and cost. The branch is sparse relative to device IP, and incumbent coverage is narrower than in H01L, making it a more accessible entry point for materials-focused research groups or equipment suppliers with novel growth reactor or precursor chemistry IP.
Search this in Eureka →How leading applicants differ by technology route
Strength of each leader across the main technology routes.
| Player | H01L 29 · Semiconductor devices | H01L 21 · Semiconductor devices | H01L 23 · Semiconductor devices | H01L 33 · Semiconductor devices | H01L 27 · Semiconductor devices |
|---|---|---|---|---|---|
| Wolfspeed Inc | Strong · 1,323 | Strong · 1,139 | Emerging · 199 | Emerging · 178 | Emerging · 148 |
| Sumitomo Electric Industries Ltd | Strong · 642 | Strong · 646 | Absent | Emerging · 93 | Absent |
| ROHM Co Ltd | Strong · 630 | Strong · 362 | Moderate · 207 | Absent | Emerging · 104 |
| Fujitsu Ltd | Strong · 543 | Strong · 402 | Emerging · 105 | Absent | Absent |
| Toshiba Corporation | Strong · 595 | Strong · 338 | Emerging · 60 | Absent | Emerging · 42 |
| Panasonic Holdings Corp | Strong · 372 | Strong · 322 | Absent | Moderate · 111 | Emerging · 58 |
| Fuji Electric Co Ltd | Strong · 419 | Strong · 325 | Emerging · 59 | Absent | Absent |
Frequently asked questions
The analysis covers 8,257 patent families in scope. The applicant ranking is built from patent records, which can exceed the family count because a single family may be assigned to multiple IPC classes or jurisdictions.
Wolfspeed Inc leads by a significant margin, followed by Sumitomo Electric Industries, ROHM, Mitsubishi Electric, and Fuji Electric. The top five filers account for 30% of the combined output of the hundred largest filers.
The field is in a Maturity stage. Annual filings peaked in 2022 at 1,161 and have eased since. The multi-year window shows modest positive growth, but annual volume is no longer climbing. Filing counts for 2024 and 2025 are under-reported due to publication lag.
The United States is the primary filing jurisdiction by a wide margin, followed by Europe (EPO) and WIPO PCT. China ranks fourth, notably below its share in many adjacent semiconductor fields.
The most active co-filing pairs are Toshiba with Toshiba Electronic Components & Storage (36 joint filings), Fuji Electric with Japan’s National Institute of Advanced Industrial Science and Technology (26), and ROHM with Nissan Motor (18). These pairings reflect both corporate family relationships and cross-sector automotive partnerships.
H02M power conversion circuits and C30B crystal growth are the two largest branches adjacent to the dominant H01L device class but with materially lower filing density. Power-circuit integration and upstream boule/epitaxy growth are the areas where the gap between commercial importance and IP density is most visible, though neither is uncontested.
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Disclaimer. This page is generated from PatSnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. PatSnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.