Wolfspeed, a pioneer in the SiC power semiconductor market, filed for Chapter 11 bankruptcy protection in June 2025. The company reached a restructuring support agreement with major creditors that included approximately $4.6 billion in debt reduction, and announced the successful completion of its financial restructuring in October of that year — yet the entire episode threw the risks of single-supplier dependence in SiC procurement into sharp relief. Renesas Electronics had provided a $2 billion deposit under its SiC wafer supply agreement with Wolfspeed; as part of the restructuring plan, Renesas converted that deposit into equity and convertible bonds, becoming a major creditor and gaining a seat on Wolfspeed's board of directors.

Key Players in the SiC Power Semiconductor Market

The top four SiC power semiconductor vendors by revenue — Infineon, STMicroelectronics, ROHM, and Wolfspeed — have each been meeting expanding demand with year-on-year growth rates of 29–42%. Additional alternative suppliers include onsemi, Fuji Electric, Mitsubishi Electric, and Chinese manufacturers. The following sections compare the characteristics of the major suppliers beyond Wolfspeed.

Infineon CoolSiC

Infineon CoolSiC MOSFETs substantially reduce both switching losses and conduction losses compared with Si-based IGBTs. The latest G2 generation further reduces losses and improves thermal resistance over its predecessor, resulting in better heat dissipation. The advantage is particularly pronounced in the lower voltage range (650 V), covering a wide range of industrial and automotive applications. With its main manufacturing base in Dresden, Europe, and a strong track record in both automotive and industrial markets, Infineon currently ranks among the suppliers offering the highest procurement stability.

onsemi EliteSiC

onsemi EliteSiC is characterized by high efficiency through low power loss and high reliability. The EliteSiC M3e MOSFET substantially reduces both conduction losses and switching losses compared with the previous generation. onsemi offers a complete portfolio spanning SiC MOSFETs, diodes, and modules from 650 V to 1700 V, enabling straightforward adoption without dependence on a specific voltage rating or application. A growing body of EV traction inverter design wins supports its track record, and the T2PAK top-cool package delivers superior thermal performance that broadens design flexibility.

ROHM — Differentiated by Short-Circuit Withstand Time

ROHM's fourth-generation SiC MOSFETs achieve both low on-resistance (Ron) and high short-circuit withstand time (SCWT) through a proprietary device structure. While SiC inherently exhibits lower SCWT than Si, ROHM's fourth-generation technology improves this trade-off, providing greater margin in protection circuit design. The company's well-developed domestic technical support infrastructure — including Japanese-language assistance and evaluation kit availability — represents a tangible advantage for Japanese manufacturers during the design and evaluation phases.

Mitsubishi Electric and Fuji Electric — Domestic Supplier Positioning

Mitsubishi Electric has developed technology that introduces a p-type protection layer into trench-type SiC MOSFETs, significantly improving SCWT. Its strengths lie in domestic manufacturing that minimizes geopolitical risk and in the ease of information sharing through established business relationships. Fuji Electric is also expanding its SiC device lineup for automotive and industrial equipment, with strong compatibility with Japan-based design and mass-production workflows.

Evaluating Chinese Manufacturers

Chinese SiC manufacturers began volume production of 8-inch wafers in 2024 and demonstrate clear price competitiveness. Wafer quality has improved rapidly in recent years and is drawing attention at international conferences. That said, in high-value automotive and industrial applications, European, U.S., and Japanese manufacturers retain an advantage through quality certifications such as AEC-Q101. When considering adoption, a comprehensive evaluation covering geopolitical risk, the outlook for long-term quality certification, and supply continuity — not price competitiveness alone — is essential.

Supplier Selection Criteria

On-resistance (RDS(on)) reduction rate
Priority
High
Key Verification Points
Request competitive comparison data under equivalent conditions
Short-circuit withstand time (SCWT)
Priority
High
Key Verification Points
Must be verified at actual operating voltage and temperature
Automotive qualification (AEC-Q101)
Priority
Mandatory for automotive
Key Verification Points
Verify per specific part number, not across the entire lineup
8-inch transition roadmap
Priority
Medium- to long-term
Key Verification Points
Confirm supply capacity plans for 2025–2028
Geographic diversity of manufacturing sites
Priority
High
Key Verification Points
Assess single-site concentration risk
Technical support infrastructure
Priority
Medium
Key Verification Points
Confirm Japanese-language support and evaluation kit availability

Summary

For those prioritizing reliability and supply stability, Infineon CoolSiC G2 and onsemi EliteSiC M3e are the leading candidates at this time. ROHM warrants consideration for protection circuit designs where SCWT is paramount. When domestic manufacturing and support are the priority, deepening relationships with Mitsubishi Electric or Fuji Electric merits evaluation. Building a multi-supplier model and establishing a long-term roadmap that captures cost reductions after the 8-inch transition will define the competitive conditions for design and procurement going forward.