Silicon technology

Infineon offers the broadest silicon power portfolio in the market, distinguished by its unmatched quality and leading in all figures of merit (FOM). This portfolio provides the best price-performance, and is easy and robust to use, with a high variety of customized optimizations for every application across all voltage classes.

Leadership in silicon power MOSFETs

Infineon is the global MOSFET market leader, offering the broadest portfolio of right-fit MOSFET products for every application. Infineon silicon power MOSFETs are designed to enable best-in-class performance, reliability and ease-of-use in power switching, control and conversion. This means more efficiency, power density and cost effectiveness for products and system solutions.

Infineon silicon power MOSFETs are highly optimized for major applications like switched mode power supplies, DC-DC converters, inverters for residential solar applications, and motor drives. Infineon offers the broadest Si MOSFET portfolio with a high variety of customized optimizations for specific application needs, with MOSFETs that are easy and robust to use. Infineon silicon power MOSFETs are setting the industry benchmark in performance excellence.

Based upon the newest MOSFET technology, they offer outstanding capabilities in switching, thermal performance, and resistance, tailored to our customers’ needs. Infineon silicon power MOSFETs meet the highest quality and protection standards, enabling assured product reliability, dependable system uptime, and proven supply stability.

The Si MOSFET market is one of the largest component markets in the power semiconductor industry. Infineon is the unprecedented leader in the high-performance segment of power MOSFETs and serves a broad variety of applications with MOSFETs as standard components and customized optimizations. Infineon excels in best price-performance ratio as well as in ease of doing business and short time to market due to optimized technologies and processes as well as with industry’s largest economies of scale in 12-inch fabs.

The Infineon power MOSFET technology roadmap is driving innovation in the industry, e.g. enabling new topologies for power conversion as multilevel AC-DC converters with 150 V MOSFETs or the integration of functionality like eFuses with protection ICs. We are further innovating with customized MOSFETs in one package or advancing cooling concepts based on the better thermal capabilities of our products such as source down packages. State of the art innovation like the world’s first 20 Micrometer silicon wafer technology is a testimonial of Infineon's technology strength. Trending applications, such as powering AI data centers in the most reliable and efficient way, rely on optimized silicon technology in multiple conversion steps across the complete power flow. Infineon silicon technology is enabling this with its reliability and availability of a broad package portfolio to support multiple cooling concepts. Infineon’s silicon experts hold strong experience to implement the highest customer demands at the speed of light, globally. Innovation from Infineon is strongly connected to performance, reliability, and ease-of-use in power switching, control, and conversion to accelerate value for customers.

Infineon silicon MOSFETs enable power solutions which increase system efficiency and power density. These devices are specifically optimized to meet individual system requirements, driving the customers’ market success while reducing the overall system cost. Based on application requirements, Infineon provides the leading-edge power switch offering in the industry covering Si (CoolMOS™, OptiMOS™, StrongIRFET™), SiC, and GaN in the widest range of power packages combined with dedicated system ICs (e.g. EiceDRIVER™ gate-driver family) and propriety power conversion topologies.

With proven technology and supply stability, Infineon enables reliable performance on a global scale. Infineon has a strong focus on high quality standards and long-term availability. With the largest silicon power MOSFET production capacity worldwide, high supply stability for customers’ demand is ensured by dual fab concepts for most of the technologies serving all markets, from six frontend and ten backend facilities and a resilient supply chain network for regional requirements. 

Infineon is the global market and technology leader for silicon power MOSFETs and power systems. With the industry’s broadest product and package portfolio, Infineon is serving any application from low to high voltage and providing the full offering of power systems with Si, SiC, and GaN solutions, with the best price-performance in the market. Infineon MOSFETs are designed to enable best-in-class performance, reliability, and ease-of-use in power switching, control, and conversion. Infineon silicon technology is a benchmark in the industry.

Infineon ultra-thin silicon wafer technology - wafer image in production site
Infineon ultra-thin silicon wafer technology - wafer image in production site
Infineon ultra-thin silicon wafer technology - wafer image in production site

Ultra-thin silicon power wafer technology

With only 20 micrometers thickness Infineon reached a breakthrough in processing the thinnest silicon power wafers ever manufactured on a diameter of 300 millimeter in a high-scale semiconductor fab. The wafers are thinner than human hair and half the thickness of current state-of-the-art wafers allowing Infineon to deliver outstanding customer value by pushing the technical boundaries of semiconductor technology. 

Silicon ultra-thin wafers will help to significantly increase energy efficiency, power density and reliability in power conversion solutions in AI data center, consumer, motor control and computing applications.

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Applications

As the leader in power systems, Infineon is mastering all three relevant semiconductor materials, with a broad portfolio in silicon (Si) alongside silicon carbide (SiC) and gallium nitride (GaN). Infineon supports customers along their requirements, offering solutions for complementary or singular use across all voltage classes and applications, leveraging all benefits of Si, SiC and GaN to accelerate customer value.

Si SiC GaN applications visual - overview of selected target applications
Si SiC GaN applications visual - overview of selected target applications
Si SiC GaN applications visual - overview of selected target applications

Discover Infineon's Si MOSFET product portfolio

OptiMOS™ and StrongIRFET™ power MOSFETs

OptiMOS™ power MOSFETs deliver best-in-class performance in combination with highest efficiency and power density. StrongIRFET™ power MOSFETs are designed for rugged industrial applications and are ideal for designs with a low switching frequency and those that require a high current carrying capability.

OptiMOS™ and StrongIRFET™

CoolMOS™ N-channel power MOSFETs

CoolMOS™ MOSFETs cater for a wide range of voltage classes with outstanding commutation ruggedness, resulting in increased efficiency and ease of use while significantly lowering switching and conduction losses.

CoolMOS™

MOSFET technology

Find out more about the MOSFET technology with this beginner's guide and dive deeper into the structure of MOSFETs, operation modes of N-channel MOSFETs, current-voltage curves, and more.

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Documents

Videos

Silicon power MOSFETs: Infineon's path to global market leadership
Learn why Infineon is the global leader in silicon power MOSFETs and how our expertise, broad portfolio, and unmatched technology are shaping the future of power electronics.
Infineon unveils silicon power wafer of only 20 micrometers thickness
To overcome the technical hurdles in reducing wafer thickness to the order of 20 micrometers, Infineon engineers had to establish an innovative and unique wafer grinding approach, since the metal stack that holds the chip on the wafer is thicker than 20 micrometers. This significantly influences handling and processing the backside of the thin wafer. Additionally, technical and production-related challenges like wafer bow and wafer separation have a major impact on the backend assembly processes
Technological breakthrough - Infineon introduces the worlds thinnest silicon power wafer
Infineon is the first semiconductor manufacturer in the world that masters handling and processing of ultra-thin 20-micrometer power semiconductor wafers which are half the thickness of conventioal wafers of 40-60 micrometers. Ultra-thin wafers reduce substrate resistance by half and cut down power losses by over 15%. The industry-first technology addresses various applications and reinforces Infineon's Powering AI roadmap.
Infineon’s leadership in silicon power MOSFETs
Infineon offers the broadest portfolio of right-fit MOSFET products for every application, designed to enable best-in-class performance, reliability and ease-of-use in power switching, control, and conversion.

Infineon silicon power MOSFET innovation history timeline

Infineon silicon power MOSFET innovation history timeline. This image shows how our Si MOSFETs evolved over time.
Infineon silicon power MOSFET innovation history timeline. This image shows how our Si MOSFETs evolved over time.
Infineon silicon power MOSFET innovation history timeline. This image shows how our Si MOSFETs evolved over time.

Frequently Asked Questions about Silicon MOSFET technologies

Silicon remains the dominant semiconductor material due to its established manufacturing ecosystem, reliable electrical properties, extensive product offering, and excellent price performance ratio.

Infineon's Si MOSFETs enable solutions for green and efficient energy, clean and safe mobility, and smart and secure IoT. AI data centers, for example, rely on optimized silicon technology across multiple conversion steps in the complete power flow, where hybrid architectures combining Si, SiC, and GaN unlock each technology's strengths for maximum efficiency and performance. Infineon’s Si MOSFETs are specifically optimized to meet individual system and application requirements, delivering reliability and a broad package portfolio while driving customers' market success and reducing overall system cost.

A Si MOSFET is a voltage‑controlled semiconductor switch that regulates power flow in electronic systems. By applying voltage to the gate, an electric field forms a conductive channel in the silicon, enabling fast, precise switching with minimal resistance. This enables efficient power conversion, distribution, and control across applications. Infineon's Si MOSFETs deliver best‑in‑class performance, reliability, and ease‑of‑use, setting the industry benchmark.

Infineon's Silicon MOSFET technology drives power supply efficiency through key innovations. Silicon-based power devices, particularly superjunction MOSFETs (CoolMOS™) and low and medium voltage MOSFETs (OptiMOS™, StrongIRFET™) continue to push performance boundaries. Innovations such as ultra-thin wafers coupled with enhanced thermal packaging improve energy efficiency, power density, and thermal behavior. This provides performance benefits in applications such as AI data centers, motor control, consumer electronics, and computing applications.

Infineon’s innovation in Si MOSFETs is strongly connected to performance, reliability, and ease‑of‑use in power switching, control, and conversion, to accelerate value for customers. Silicon MOSFET technology continues to evolve through targeted innovations that push performance boundaries:

Ultra‑thin wafers and improved packaging for Si MOSFETs

·       20‑µm wafers boost power density, efficiency, and reliability for applications including AI data centers.

Superjunction Si MOSFET innovations (CoolMOS™)

·       Deliver lower conduction and switching losses, enabling higher‑efficiency and higher‑power systems.

·       Typically preferred for higher‑voltage/offline power conversion (e.g., PFC, LLC, flyback)

·       Enables higher switching frequencies and compact magnetics in many topologies

Advanced trench Si MOSFETs (OptiMOS™ and StrongIRFET™)

·       Typically preferred for low‑ to mid‑voltage applications with high current

·       Deliver extremely low RDS(on) , high switching speed, and extended SOA — key for telecom, server, datacom, solar, and battery‑powered applications.

Commonly used in synchronous rectification, DC‑DC stages, and power distribution 

Hybrid architectures combining Si MOSFETs, SiC, and GaN offer a balanced approach to meeting various needs in future system architectures where modular design unlocks each technology's strengths, maximizing efficiency, power density, cost, and time-to-market.

AI data centers rely on optimized silicon technology in multiple conversion steps across the complete power flow. Infineon silicon technology enables this with its reliability and availability of a broad package portfolio to support multiple cooling concepts. 

Silicon-based semiconductors power the technologies shaping our everyday lives - from electric vehicles and AI data centers to renewable energy systems, industrial motor drives, and even next-generation humanoids. At the heart of these applications are Infineon’s Si MOSFET product families that enable efficient power management:

  • Si MOSFETs
    • OptiMOS™ (low- and mid-voltage, industrial trench MOSFETs)
    • StrongIRFET™ (low- and mid-voltage, standard grade, rugged MOSFETs)
    • CoolMOS™ (high‑voltage superjunction MOSFETs)
  • Small Signal Si MOSFETs

Si MOSFETs enable efficient, reliable power conversion and are essential to the energy and digital transition. As silicon evolves through innovations like ultra-thin wafers, superjunction technology, and advanced trench MOSFETs, Infineon's market leadership is built on:

  • The broadest Si MOSFET portfolio with a high variety of customized optimizations for specific application needs, with Si MOSFETs that are robust and easy to use. Infineon’s Si MOSFETs are setting the industry benchmark in performance excellence.
  • Best price-performance ratio across the portfolio from standard to high-performance components.
  • World-class innovation in manufacturing, performance, reliability, and ease-of-use.
  • Infineon’s Si MOSFETs are designed to enable best-in-class performance, reliability, and ease-of-use in power switching, control, and conversion. Infineon silicon technology is a benchmark in the industry.
  • With the largest Si MOSFET production capacity worldwide, high supply stability for customers’ demand is ensured by dual fab concepts for most of the technologies serving all markets, from six frontend and ten backend facilities and a resilient supply chain network for regional requirements.
  • Infineon’s Si MOSFETs enable power solutions which increase system efficiency and power density. These devices are specifically optimized to meet individual system and application requirements, driving the customers’ market success while reducing the overall system cost.
  • Ultra‑thin silicon wafer technology increasing energy efficiency, power density and reliability in power conversion.

Silicon MOSFET technology remains the backbone of modern electronics and power systems due to its established manufacturing ecosystem, reliable electrical properties, and excellent price‑performance ratio. Its mature technology base enables high‑volume production with consistent quality, while ongoing innovations push performance boundaries in switching speed, thermal management, and on‑resistance. As the global market leader, Infineon offers the broadest silicon power MOSFET portfolio with customized optimizations for specific application needs.