The power module market has long been dominated by a European, Japanese, and US oligopoly, but the competitive landscape is shifting as the industry enters the SiC transition. The track records and market share built on silicon IGBT technology will not simply carry over to the SiC era. Manufacturing capability for SiC, the presence or absence of vertical integration, and custom design capability are emerging as new differentiating axes. This article reviews the current state of the six primary suppliers worth referencing when evaluating procurement sources.
The Broader Market Picture — Restructuring Driven by the SiC Transition
Historically, the power module market was dominated by IGBT track records from Infineon, Mitsubishi Electric, Fuji Electric, and ABB (now Hitachi Energy). However, the SiC transition is generating new competitive axes.
Vertical Integration: Because SiC wafers are difficult to source and expensive, manufacturers that can source wafers from their own operations or affiliated companies (integrated production from wafer → chip → module) have advantages in supply stability and cost competitiveness. Wolfspeed and Rohm manufacture their own wafers, while STMicro is building its own wafer supply through a joint venture with Stellantis.
Module Packaging Technology: Extracting the full performance of SiC devices requires optimized encapsulation materials, thermal design, and low-inductance structures. Module design capability is equally important as device performance as a differentiator.
Leading European and US Suppliers
Infineon Technologies (Germany)
Full-range lineup spanning SiC, GaN, and IGBT. SiC is marketed under the CoolSiC brand with 1200V and 650V products for automotive and industrial applications. 8-inch SiC manufacturing capacity at the ORICOSA fab (Dresden) is a key strength. Commands the largest market share in the category. In the automotive segment, it has delivery track records with Tesla, BMW, and Hyundai, supporting strong brand credibility. The GaN Systems acquisition has also reinforced its GaN capabilities.
onsemi (US)
Concentrating investment in SiC under the EliteSiC brand. Its manufacturing network across the Czech Republic (Roznov), Korea, and the US, combined with long-term supply contract track records for EV applications at GM and Ford, are key commercial strengths. It is advancing in-house SiC wafer investment to increase its degree of vertical integration. High dependence on EV applications means heightened sensitivity to EV market fluctuations.
STMicroelectronics (Europe)
Strengthening vertical integration through an in-house SiC wafer joint venture with Stellantis (Sicily plant). Markets the MasterSiC brand for industrial and automotive applications. A strong European customer base and long-term contracts in anticipation of CBAM and European regulations are its differentiating factors. Full-range coverage of GaN (MastGaN) and IGBT (HB series) alongside SiC is a characteristic of its offering.
Japanese Supplier Profiles and Strengths
Mitsubishi Electric
Japan's largest track record in IGBT modules. High reliability in rail traction and industrial inverter applications, with strong custom design capability for high-current, high-voltage modules. SiC is being deployed for industrial applications under the X-Series. Extensive high-voltage expertise from the Hitachi ABB power grid collaboration. Its competitive strengths are most pronounced in high-value-added and custom projects rather than mass production.
Fuji Electric
A strong customer base in industrial IGBT modules. SiC is offered for automotive and industrial applications under the V and X series. Its unique heat dissipation structure (AlSiC base plate, etc.) and long-term supply commitment are highly regarded. Maintaining compatibility with customers' design archives is also a differentiating factor. Long-standing trade relationships with domestic inverter manufacturers are robust, and design change support capability is well established.
Rohm Semiconductor
Vertical integration from SiC chip to module enables both price competitiveness and quality control. High-breakdown-voltage 1700V products are deployed for industrial applications. Application design support for power electronics is comprehensive, with a strong track record of adoption by mid-tier domestic design companies. As a pioneer in SiC volume production, Rohm is among the leaders — alongside Wolfspeed — in the transition to 8-inch wafers.
Supplier Competitiveness Mapping by Product
SiC Modules for EVs (400–800V)
Infineon, onsemi, and STMicro have secured OEM positions through long-term supply contracts. Rohm has strengths in the Japanese OEM and Tier 1 segment. Mitsubishi Electric and Fuji Electric are moving toward differentiation through custom and specialized specifications for EVs rather than pursuing large-scale mass production.
Industrial SiC Modules (1200–1700V)
Rohm, Mitsubishi Electric, and Fuji Electric are strong in the domestic industrial segment. Infineon has a strong track record with European industrial equipment manufacturers. STMicro is expanding into industrial applications as well, but domestic market share in Japan remains low.
Rail and High-Voltage IGBTs (2700–6500V)
Mitsubishi Electric, Fuji Electric, and Infineon are the top three players. These three companies virtually control the market for high-voltage modules above 2,700V. SiC deployment in rail applications is still in its early stages, and the replacement of Si IGBTs is expected to take 10–15 years.
Axes for Supplier Selection
Presence of Manufacturing Vertical Integration
Vertically integrated suppliers that manufacture wafers, epitaxial layers, chips, and modules in-house have advantages in quality traceability and supply stability. This is particularly valuable as a buffer when SiC wafer procurement tightens. It is recommended to add 'SiC wafer in-house sourcing ratio' as a verification item in supplier evaluation.
Custom Module Design Capability
When standard products do not meet the required current rating, package dimensions, or terminal layout, design flexibility and minimum order quantity (MOQ) determine selection. The number of suppliers capable of handling small-volume custom orders is limited. Confirm in advance the track record of custom design projects and the expected lead time.
LTB (Last Time Buy) Policy
Industrial equipment product lifespans extend to 10–20 years. Pre-documenting the supplier's policy covering the period from EOL (end-of-life) notice through LTB acceptance and alternative product proposals is directly linked to supply chain risk reduction. The three Japanese suppliers have a strong track record of long-term supply commitments for domestic industrial applications, but European and US suppliers may have LTB rules that vary by product line — part-number-by-part-number confirmation is therefore necessary.
Competitive Axis Shifts in 2026–2028
The competitive landscape in the power module market is expected to shift further as the SiC transition intensifies between 2026 and 2028. Key directions of change include:
- Progress in 8-Inch Wafer Volume Production: Wolfspeed and Infineon are leading the way, with mass-production cost reductions accelerating in 2026–2027. Suppliers unable to keep pace will lose cost competitiveness.
- Expansion of EV Direct Procurement: OEM direct device procurement models are spreading, driving a shift toward Tier 1 suppliers focusing solely on module design and assembly.
- The Rise of Chinese-Made SiC Modules: BYD Semiconductor and Starpower Semiconductor are accelerating international deployment of industrial SiC modules.
The SiC transition period is also an opportunity to reassess existing supplier relationships. When considering new supplier adoption, the process of technical evaluation, quality verification, and qualification typically takes 6–18 months, making it important to begin advance evaluation now in anticipation of the full SiC demand ramp from 2026 onward. Conducting a parallel assessment today of whether current IGBT procurement sources can maintain their competitiveness in the SiC era is the foundation of proactive procurement risk management.