Toshiba develops package technology for silicon carbide (SiC) power modules

Toshiba Electronic Devices & Storage Corporation (Toshiba) has developed package technology for silicon carbide (SiC) power modules that doubles their reliability and reduces their footprint by 20%, the company said on Monday.

“SiC realizes higher voltages and lower losses than silicon, and is widely seen as the next-generation material for power devices. While use now centers on inverters for trains, wider deployment in high-voltage applications is on the horizon, including in photovoltaic power systems and automotive equipment.

“Reliability is the main concern that has limited use of SiC devices. Application in high voltage power modules requires that not only the semiconductor chip but also the package itself delivers high-level reliability. Toshiba has achieved this with a new silver (Ag) sintering technology for die bonding.

“With current SiC packages, it is difficult to suppress increased on-resistance in chips over time, as higher power densities and switching frequencies trigger deterioration in their soldering. Ag sintering significantly reduces this deterioration. The thermal resistance in the Ag-sintered layer is also half that of a soldered layer, which allows chips in the module to be positioned closer together, realizing a smaller footprint.

“Toshiba has dubbed the new package iXPLV, and will apply it to mass production of 3.3kV class SiC power module from the end of this month.” 

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