SiC Device Reliability Patent Landscape 2026
SiC device reliability IP is heavily concentrated among a small group of established power-semiconductor incumbents — Fuji Electric, Infineon, and Wolfspeed together account for a dominant share of the 642 patent families in scope. Annual filing volume peaked in 2019 and has eased since, signaling a maturing but still active field where late entrants face a high prior-art bar.
Fuji Electric leads a tightly consolidated field
Fuji Electric holds the top position in this landscape, followed closely by Infineon Technologies and Wolfspeed. The top five filers collectively represent 50% of the combined patent records of the hundred largest filers, indicating a high degree of consolidation among the leading applicants.
A clear two-tier structure is visible: Fuji Electric and Infineon are separated from the rest of the top five by a significant margin, while a mid-tier cluster — including General Electric, Mitsubishi Electric, and Semicon Components — trails at roughly one-third of the leaders’ volumes. Below rank six, counts drop sharply.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Fuji Electric Co., Ltd. | 144 | |
| 2 | Infineon Technologies AG | 131 | |
| 3 | Wolfspeed Inc. | 93 | |
| 4 | General Electric Company | 50 | |
| 5 | Mitsubishi Electric Corporation | 46 | |
| 6 | Semicon Components Industries LLC | 46 | |
| 7 | Rohm Co., Ltd. | 42 | |
| 8 | Toshiba Corporation | 40 | |
| 9 | Denso Corporation | 31 | |
| 10 | Sumitomo Electric Industries, Ltd. | 23 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Hangzhou Puxi Guangjing Semiconductor Technology Co., Ltd. | 22 | |
| 12 | Panasonic Intellectual Property Management Co., Ltd. | 15 | |
| 13 | Fairchild Semiconductor Corporation | 12 | |
| 14 | II-VI Advanced Materials LLC | 11 | |
| 15 | TOSHIBA ELECTRONICS DEVICES & STORAGE CORPORARTION | 11 | |
| 16 | Hitachi, Ltd. | 9 | |
| 17 | Toyota Motor Corporation | 9 | |
| 18 | Hitachi Energy Switzerland AG | 9 | |
| 19 | Michael R. Melloch | 8 | |
| 20 | James Albert Cooper Jr. | 8 |
The leaders’ positions reflect decades of sustained SiC-specific R&D investment, predominantly in device architecture and process technology. Their entrenched portfolios raise the prior-art density in the core H01L semiconductor-device branch, making differentiation increasingly dependent on process refinement or system-level integration.
Filing counts for 2024 and 2025 are subject to publication lag and likely understate true activity; the apparent recent dip should not be read as a definitive contraction. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A 2019 filing peak and a device-centric technology mix
Two charts together reveal the temporal arc of this field and where technical effort is concentrated. Annual volumes climbed from 2017 to a 2019 peak before easing, while the IPC composition shows an overwhelming focus on core semiconductor-device classes.
Annual filing trend
Filings rose from 67 records in 2017 to a peak of 109 in 2019, pulled back to 83 in 2020, recovered partially to 101 in 2021, then eased to the mid-60s–80s range through 2023. Data for 2024 onward reflect publication lag and will fill in as applications publish; do not read the low 2024–2025 figures as confirmed decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01L (semiconductor devices) dominates the IPC distribution by a wide margin, with H10D (general semiconductor devices) as a secondary cluster. Adjacent branches such as H10P, H10W, G01R (electric and magnetic measurement), and H02M (power conversion) each hold small but potentially meaningful shares, indicating that system-level and measurement applications remain relatively underdeveloped compared to the core device work.
↗ 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.
Avalanche-rugged silicon carbide (SIC) power device
In at least one general aspect, a silicon carbide (SiC) device can include a drift region and a termination region at least partially surrounding the SiC device. The termination region can have a first transition zone and a second transition zone. The first transition zone can be disposed between a first zone and a second zone, and the second zone can have… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | High brightness electroluminescent device emitting… | 484 |
| 2 | Layered dielectric on silicon carbide semiconducto… | 173 |
| 3 | Silicon carbide semiconductor device and method of… | 118 |
| 4 | Static-induction transistors having heterojunction… | 117 |
| 5 | Silicon carbide switching devices having near idea… | 111 |
| 6 | Self-aligned shielded-gate trench MOS-controlled s… | 108 |
| 7 | SiC power MOSFET device structure | 108 |
| 8 | SiC semiconductor device | 99 |
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
Four structural dimensions — maturity, concentration, collaboration, and geography — shape the strategic risk and opportunity profile for any team considering SiC device reliability R&D.
Post-peak, entering consolidation
The lifecycle evidence indicates annual filing activity has eased back from its 2019 peak, placing this field in a declining phase of its patenting cycle. This does not mean innovation has stopped, but it does suggest that the broadest foundational claims have been filed and the frontier has shifted toward incremental refinement and application-specific optimization. Teams entering now should conduct thorough freedom-to-operate analysis against the dense incumbent portfolios.
Post-peakTop five control half the leading-filer volume
The top five filers account for 50% of patent records across the hundred largest filers, and the gap between tier one (Fuji Electric, Infineon) and tier two (GE, Mitsubishi, Semicon Components) is substantial. This concentration implies that licensing or cross-licensing with the top two players is likely unavoidable for any commercial SiC reliability program. Challengers must either identify unoccupied technical niches or secure design-around strategies before scaling.
High concentrationToshiba–Toshiba Electronics and Denso–Toyota are the most active co-filing pairs
The most active co-filing partnership is between Toshiba and Toshiba Electronics Devices & Storage, with 11 joint records, reflecting an intra-group coordination structure. Denso and Toyota co-filed 9 records together, signaling automotive-powertrain-driven reliability research. Fuji Electric co-filed 7 records with the National Institute of Advanced Industrial Science and Technology (AIST), highlighting the role of Japan’s public research infrastructure in this domain. Fuji Electric also has smaller co-filing relationships with Denso, Mitsubishi Electric, and Toshiba.
Japan-anchoredU.S. filings dominate; China and Europe are secondary
The United States is the leading filing jurisdiction by a wide margin, followed by China and the EPO region. WIPO PCT filings and Germany round out the top five jurisdictions. The relative scarcity of filings in Japan — despite Japanese firms dominating the applicant rankings — may partly reflect domestic filing strategies or data-coverage differences. South Korea and India show early-stage presence, consistent with emerging domestic SiC industry ambitions in those markets.
U.S.-dominantGo 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 | 11 |
| Denso Corporation | Toyota Motor Corporation | 9 |
| Fuji Electric Co., Ltd. | National Institute of Advanced Industrial Science and Technology (AIST) | 7 |
| Fuji Electric Co., Ltd. | Denso Corporation | 3 |
| Fuji Electric Co., Ltd. | Mitsubishi Electric Corporation | 2 |
| Fuji Electric Co., Ltd. | Toshiba Corporation | 1 |
| Toshiba Corporation | National Institute of Advanced Industrial Science and Technology (AIST) | 1 |
| Denso Corporation | Fuji Electric Co., Ltd. (Mirai-sha Technology) | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Fuji Electric and Infineon set the competitive benchmark
The two leading applicants differ slightly in trajectory: Fuji Electric has maintained a stable recent filing pace while Infineon has pulled back materially. Both concentrate almost entirely on core semiconductor-device IPC classes.
Fuji Electric Co., Ltd.
Fuji Electric leads the corpus with 144 patent records and shows a stable filing trajectory (flat at 0% change versus the prior three-year window), suggesting a deliberate and sustained program rather than a surge-and-retreat pattern. Its technical focus is concentrated in H01L 29 (semiconductor devices) and H01L 21 (fabrication processes), with a secondary presence in H10D 62. This breadth across device architecture and process technology reinforces its position as the field’s primary incumbent.
patent records: 144Infineon Technologies AG
Infineon Technologies ranks second with 131 patent records but its recent filing trend shows a sharp decline of 66% versus its prior three-year window, indicating a strategic shift away from foundational SiC reliability patenting — possibly toward application-layer or manufacturing-process differentiation outside this corpus’s scope. Its IPC profile mirrors Fuji Electric’s, with strong coverage of H01L 29, H01L 21, and H10D 62. Despite the recent pullback, its accumulated portfolio remains a formidable competitive barrier.
patent records: 131| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Fuji Electric Co., Ltd. | 39 | ▬ 0% |
| Infineon Technologies AG | 25 | ▼ -66% |
| Wolfspeed Inc. | 12 | ▬ 0% |
| General Electric Company | 1 | ▲ new entrant |
| Mitsubishi Electric Corporation | 1 | ▼ -91% |
| GeneSiC Semiconductor Inc. | 5 | ▼ -87% |
| Rohm Co., Ltd. | 10 | ▼ -55% |
| Toshiba Corporation | 2 | ▼ -83% |
Under-served branches adjacent to the SiC device core
Several IPC branches sit at the periphery of the dominant H01L cluster with relatively low filing counts. These are observations of relative sparsity; technical and commercial merit should be validated independently before treating them as investment targets.
G01R — Electric & Magnetic Measurement
With 30 patent records, G01R is an under-served branch relative to the device-centric core. In-situ and post-fabrication electrical characterization methods — such as threshold-voltage drift measurement, interface trap density quantification, and gate-oxide integrity testing specific to SiC — remain sparse in the corpus. Engineers developing standardized reliability test protocols or prognostic health-monitoring systems for SiC modules would encounter a less crowded prior-art landscape here. A realistic entry path involves combining established SiC device knowledge with metrology and condition-monitoring expertise, areas where few current top filers hold strong positions.
Search this in Eureka →H02M — Power Conversion (AC/DC)
H02M holds only 9 patent records in this corpus, making it one of the sparsest adjacent branches. System-level reliability concerns — such as switching-transient-induced gate-oxide stress, thermal cycling in converter topologies, and surge-current reliability of SiC-based inverters — are technically distinct from device-level work and are poorly covered here. Given the rapid uptake of SiC MOSFETs in EV drivetrains and grid converters, there is plausible technical value in reliability-oriented power-conversion IP. Entry requires bridging SiC device physics with power-electronics converter design, a combination that few top-ranked applicants currently emphasize in this corpus.
Search this in Eureka →How leading applicants differ by IPC technology route
Route coverage across the main technology branches in the current evidence set.
| Player | H01L 29 · Semiconductor devices | H01L 21 · Semiconductor devices | H10D 62 · Semiconductor devices (general) | H10D 64 · Semiconductor devices (general) | H10D 30 · Semiconductor devices (general) |
|---|---|---|---|---|---|
| Infineon Technologies AG | Strong · 132 | Strong · 75 | Moderate · 42 | Moderate · 38 | Emerging · 25 |
| Fuji Electric Co., Ltd. | Strong · 141 | Strong · 71 | Moderate · 30 | Emerging · 16 | Emerging · 22 |
| Wolfspeed Inc. | Strong · 85 | Strong · 55 | Emerging · 10 | Emerging · 9 | Emerging · 9 |
| Mitsubishi Electric Corporation | Strong · 42 | Moderate · 21 | Moderate · 20 | Moderate · 11 | Moderate · 15 |
| General Electric Company | Strong · 44 | Strong · 28 | Moderate · 13 | Emerging · 4 | Emerging · 7 |
| GeneSiC Semiconductor Inc. | Strong · 34 | Moderate · 10 | Strong · 29 | Moderate · 12 | Moderate · 8 |
| Rohm Co., Ltd. | Strong · 41 | Moderate · 19 | Moderate · 10 | Moderate · 9 | Emerging · 8 |
Frequently asked questions
The corpus contains 642 patent families in scope. This total reflects the full multi-year dataset and is distinct from the patent record counts used in applicant rankings, where a single family can generate multiple records across jurisdictions.
Fuji Electric Co., Ltd. leads with 144 patent records, ahead of Infineon Technologies at 131 and Wolfspeed at 93. These three together account for a large share of the activity among the top-ranked applicants.
The lifecycle evidence indicates annual filing volume peaked in 2019 and has eased since, placing the field in a post-peak phase. Note that 2024 and 2025 data are affected by publication lag and will likely fill in as more applications publish, so the recent low counts should not be read as confirmed decline.
The United States is the leading filing jurisdiction by a wide margin, followed by China and the EPO region. Germany, Canada, and WIPO PCT filings also appear in the top tier. South Korea, India, and Japan have smaller but present filing activity.
The most active co-filing pair is Toshiba and Toshiba Electronics Devices & Storage with 11 joint records, followed by Denso and Toyota with 9, and Fuji Electric together with Japan’s National Institute of Advanced Industrial Science and Technology (AIST) with 7. Fuji Electric also has smaller co-filing relationships with Denso, Mitsubishi Electric, and Toshiba.
The sparsest adjacent branches relative to the dominant H01L core are H02M (power conversion, 9 records) and G01R (electric and magnetic measurement, 30 records). System-level reliability for SiC-based converters and standardized characterization or condition-monitoring methods are areas where existing prior-art density is lower than in the core device architecture and fabrication branches.
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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.
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