All-SiC VJFET power module developed by SemiSouth

(September 8, 2010 – BUSINESS WIRE) — SemiSouth Laboratories Inc., manufacturer of silicon carbide (SiC) technology for high-power, high-efficiency, harsh-environment power management and conversion applications, presented “Low Switching Energy 1200V Normally-Off SiC VJFET Power Modules” at the European SiC and Related Materials Conference (

The paper presents the development of an all-SiC-based power module for use in high-frequency and high-efficiency applications. “As SiC devices migrate to applications above 20-30kW, multi-chip power modules offer the most energy-efficient and practical solution for a wide range of applications such as high-power commercial solar inverters, electric vehicle inverters and electric actuators in aircraft. However, the high speed transients capable in SiC devices at high voltages and currents highlight the need for careful design considerations for gate drive, wiring, layout, and module parasitics,” said SemiSouth co-founder and CTO Dr. Jeffrey B. Casady. He co-authored the paper with lead author and presenter, Dr. David C. Sheridan, director of engineering.

The module described uses SemiSouth’s high-speed, normally off 1200V SiC VJFET technology, and demonstrates low hard-switching performance (1.25mJ) in an optimized, commercially-available (SP1) module configuration. Parasitic oscillations and cross-conduction were shown to be well-controlled using optimized internal snubbers and a negative gate voltage rail. Utilizing parallel combinations of enhancement mode SiC VJFETs (36mm²) and Schottky diodes (23mm²), a total on-resistance of only 10m? (2.7mΩ/cm²) was achieved at drain currents of 100A in the commercially available standard module configured as a half-bridge circuit.

Concludes Casady: “A significant percentage of the targeted customers for SiC power transistors will favor devices integrated into the module form factor presented here for higher power and complexity, saving cost and area in the overall system design.”

SemiSouth Laboratories Inc. produces silicon carbide (SiC) power devices and electronics, targeting applications such as solar inverters; power conversion in computing and network power supplies; variable-speed drives for industrial motors and hybrid electric vehicles; and products used in high-power, harsh-environment military and aerospace environments. More information is available at

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