New-generation 1.2kV IGBT modules will cut inverter losses by up to 19%
19 May 2026 
Mitsubishi Electric has announced a new generation of 1.2kV IGBT (insulated gate bipolar transistor) modules that, it says, will reduce power losses by up to 19%, thus cutting the power consumption of the inverters used to control machine tools, industrial robots and high-capacity motor-drive systems.
The ten eighth-generation NX-type modules span current ratings from 300A to 1kA. By optimising the IGBT and diode layout, Mitsubishi has developed a 1kA model with a current rating that is 1.25 times higher than existing seventh-generation models, thus delivering higher inverter outputs. It uses the same packaging and terminal positions, allowing easy replacement of existing modules, and helping to shorten inverter development times.
A proprietary “split dummy active” structure in the new modules suppresses dV/dt, which can cause noise and make high-speed switching more difficult. The result is faster switching than in seventh-generation IGBTs, and lower power losses during switch-on.
Another proprietary development, a carrier plasma layer, suppresses over-voltages during switch-off, which can lead to IGBT failures. It also allows thinner IGBT chips, helping to cut power losses during turn-on, turn-ff and conduction.
The new IGBT modules will make their debut at the PCIM (Power Conversion Intelligent Motion) exhibition in Germany in June. Samples will start to be shipped the following week, with all ten models being available by September.
Inverters are used to control the rotation speed and power supply capacity of motors in machine tools, cranes and other industrial equipment.
