What are the representative models of silicon carbide (SiC) Schottky diodes?

Silicon carbide (SiC) Schottky diodes occupy an important position in the field of power electronics due to their low loss, high-frequency characteristics, and high temperature resistance advantages. The following provides a detailed analysis from three aspects: technical characteristics, representative models, and application scenarios:
Technical characteristics and core advantages
SiC Schottky diodes are made of wide bandgap material silicon carbide, with a bandgap width of 3.2 eV, far exceeding the 1.1 eV of silicon-based devices. This enables the device to withstand voltage of over 1200V, shorten the reverse recovery time to within 20ns, and reduce switching losses by more than 50%. The unique junction barrier Schottky (JBS) structure effectively suppresses reverse leakage current, coupled with high thermal conductivity (49W/cm · K), and can operate stably in environments ranging from -40 ℃ to 175 ℃, suitable for high-frequency (1MHz) scenarios. Compared to silicon-based fast recovery diodes, SiC SBD has a lower forward voltage drop. For example, the WNSC6D10650T from Rui Neng Semiconductor has a room temperature voltage drop of only 1.29V at 10A current and is still controlled within 1.65V at 150 ℃, significantly improving energy efficiency.
Representative model and manufacturer's technical path
International benchmark products from manufacturers
Wolfspeed (Cree): The C3D series covers voltage levels from 650V to 1700V, such as C3D06060A supporting 60A current, using third-generation epitaxial technology, suitable for electric vehicle inverters and photovoltaic inverters.
Rohm: SCT3027AL integrates low on resistance and high-frequency characteristics, with a forward voltage drop of 1.35V, suitable for motor drive and charging stations.
Infineon: FFD100N65S2 has passed automotive grade certification, with a withstand voltage of 650V and a current of 100A, suitable for industrial power supply and rail transit.
ST Microelectronics: The STPSC10065 series is optimized for the photovoltaic field, with a forward voltage drop of 1.5V under 1200V withstand voltage, resulting in significant efficiency improvement.
Domestic manufacturers' innovation breakthroughs
Wuxi Guojing Micro: The HLS series achieves full voltage coverage from 650V to 1700V, such as HLS065H006B supporting 6A current, which has passed industrial reliability testing and is applied to smart grids and high-frequency welding.
Ruineng Semiconductor: The WNSC series adopts the sixth generation epitaxial+wafer bonding technology, such as the WNSC6D10650T, which has a forward voltage drop of 1.29V at 10A current and outstanding high-temperature stability, making it suitable for LED drivers and power modules.
Qingjia Electronics: B3D40120H2 is the preferred choice for photovoltaic inverters, supporting 40A current under 1200V withstand voltage and optimizing switch losses with zero reverse recovery charge characteristics.
Vishay: The third-generation 1200V SiC SBD adopts a hybrid PIN Schottky (MPS) structure, with a current range of 5A to 40A and low capacitance charge characteristics to improve the energy efficiency of the switching power supply.
Application scenarios and market trends
In the field of electric vehicles, SiC SBD is used for on-board chargers and traction inverters to improve the efficiency of high-voltage platforms and reduce their size. For example, the Tesla Model 3 inverter uses SiC devices to increase battery life by 10%. In photovoltaic inverters, the high-frequency characteristics of SiC SBD improve conversion efficiency to 99% while reducing system weight. In the field of industrial power supply, UPS and frequency converters achieve high-frequency design through SiC SBD, reducing capacitor volume and improving energy efficiency. With the maturity of 8-inch substrate technology and the continuous decrease in production costs, it is expected that the global SiC power device market size will reach 3 billion US dollars by 2025, and the penetration rate will continue to increase in fields such as new energy vehicles and renewable energy.
In summary, silicon carbide Schottky diodes demonstrate irreplaceable advantages in high voltage, high frequency, and high temperature scenarios through material properties and structural innovation. With technological iteration and cost optimization, their application boundaries will continue to expand, promoting the development of power electronics towards higher efficiency and compactness.