650V IGBTs Deliver Efficiency with Soft Switching


Beneficial for power conversion in general-purpose inverters, consumer appliances such as ACs (Air Conditioners), IH (Induction Heaters) as well as industrial equipment

ROHM has announced the availability of two types of 650V IGBTs (Insulated-gate bipolar transistor) that combine class-leading low conduction loss with high-speed switching characteristics.

The value of the IGBTs ranges from converters for consumer appliances such as ACs and IH as well as industrial equipment including power conditioners, welding machines and UPS (Uninterrupted Power Supplies).

Short-circuit tolerance

In recent years, the emergence of IoT (Internet of things) has caused an exponential growth in the volume of data while the number of UPS and servers have boosted power consumption. Therefore, to manage the above situation, ROHM has offered a total of 21 models in which the RGTV product-series features short-circuit tolerance while the RGW product-series delivers fast-switching speed.

Improves functionality and capacity of data centres

The IGBT models are equipped with thin wafer technology and a proprietary structure to give the class-leading performance, which optimises the trade-off relationship between conduction loss and switching speed.

For example, when used in an interleaved PFC (Power Factor Correction) circuit, efficiency is improved by 1.2% at light loads and 0.3% under heavy loads, contributing to lower application power consumption.

In addition, optimising the internal design allowed IGBTs to achieve smooth switching characteristics that decrease voltage overshoot by 50%.

Combines industry low conduction loss


The RGTV and RGW series has adopted thin wafer technology that reduces wafer thickness by 15% over conventional products. It has a structure that features a refined cell design to provide the industry’s lowest conduction loss (VCE(sat)=1.5V) with fast switching characteristics (tf=30 to 40ns).

Enables soft switching operation reducing design load

Internal device optimisation makes it possible to achieve soft switching for smooth ON/OFF operation. This lowers voltage overshoot during switching by as much as 50% over conventional products, reducing the number of external parts required such as gate resistors and snubber circuits.

Also, it eliminates the need for overshoot countermeasures on the application side hence minimising design load. Adding two new models such as RGTV series featuring a short-circuit resistance of 2us and the fast-switching RGW series ensures support for a broader range of applications.

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