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A SiC chip is a new type of wide-bandgap electronic device material. It is a composite material composed of silicon and carbon, offering advantages such as high thermal conductivity, high electrical conductivity, high dielectric strength, and high voltage withstand capability. SiC chips can be used to manufacture high-power, high-efficiency electronic devices, such as MOSFETs, IGBTs, JFETs, and other power electronic devices.
Cost-effective high-power, high-temperature semiconductor devices are fundamental components for power electronics applications. SiC is a wide-bandgap semiconductor material that offers many advantages over Si in applications. Due to its wider bandgap, SiC devices have a theoretical operating temperature of up to 600°C (in practice, this is generally limited to within 175°C due to packaging material constraints), whereas Si devices are limited to operating temperatures within 150°C. The high-temperature operating capability of SiC devices reduces the system's thermal budget requirements. In addition, SiC devices feature higher thermal conductivity, high breakdown electric field strength, high saturation drift velocity, high thermal stability, and chemical inertness, with a breakdown electric field strength higher than that of comparable Si devices.
Packaging technology refers to the technology of encapsulating electronic components in a housing to protect them from external environmental damage and enable them to function properly. Packaging technology can be divided into hot packaging technology and cold packaging technology. Hot packaging technology encapsulates electronic components in a hot-melt adhesive to protect them from external environmental damage, while cold packaging technology encapsulates electronic components in a plastic housing to protect them from external environmental damage.
The packaging substrate for SiC devices must facilitate the processing of solid copper thick-film conductive layers and have high thermal conductivity and a low coefficient of thermal expansion, so that large-size SiC chips can be soldered directly onto the substrate. SiN is a highly attractive substrate because it has reasonable thermal conductivity (60W/m-K) and a low coefficient of thermal expansion (2.7ppm/°C), which is very close to that of SiC (3.9ppm/°C). Soldering is a common method for attaching chips to substrates. Soft soldering can relieve stress but at the cost of thermal fatigue and low strength, while hard soldering provides high strength but cannot relieve stress. Transient liquid phase bonding requires a diffusion barrier to prevent interdiffusion between the copper metallization layer on the Si3N4 substrate and the Au layer used to bond the SiC chip; this technique can also be used for die attachment at high temperatures.
The packaging technologies for SiC power devices mainly include TO-247, TO-220, D2PAK, IPAK, SIP, DIP, SMD, and other package types.
The TO-247 package is the most commonly used package type, offering good heat dissipation performance and meeting the requirements of high-power applications.
The D2PAK package is a small, lightweight package type that meets the requirements of high-power applications.
The IPAK package is a small, lightweight package type that meets the requirements of high-power applications.
The SIP package is a small, lightweight package type that meets the requirements of high-power applications.
The DIP package is a small, lightweight package type that meets the requirements of high-power applications.
The SMD package is a small, lightweight package type that meets the requirements of high-power applications.
