AC/DC Converter ICs with a Built-In 1700V SiC MOSFET

Achieves unparalleled miniaturization, reliability, and energy savings in 400VAC industrial equipment

Industry’s First AC/DC converter ICs with a built-in 1700V SiC MOSFET, the BM2SCQ12xT-LBZ series released by ROHM Semiconductor. This series is optimized for industrial applications including street lamps, commercial AC systems, and general-purpose AC servos and inverters used in high power equipment.

SiC power semiconductors deliver greater power efficiency, miniaturization, and higher voltage capability than the existing Si power devices. In recent years, the growing demand for energy savings has resulted in the adoption of power semiconductors such as SiC in 400VAC industrial applications. On the other hand, industrial equipment consists of the main power supply circuit and a built-in auxiliary power supply that supplies power to various control systems. The use of low voltage Si-MOSFETS and IGBTs limits the amount of power savings in auxiliary power supply.

In response, ROHM has strived to lead the development of ICs that maximize the performance of SiC power semiconductors. In 2015, the company became the first to offer AC/DC converter ICs for driving high voltage, low-loss SiC MOSFETs. This time, we created the industry’s first AC/DC converter ICs with a built-in SiC MOSFET that will further accelerate the adoption of AC/DC converters that use SiC MOSFETs in industrial equipment.

AC/DC Converter ICs with a Built-In 1700V SiC MOSFET

Furthermore, the BM2SCQ12xT-LBZ series integrate 1700V SiC MOSFET, which is also an industry first. This series enables breakthrough energy savings and facilitates efficient AC/DC converter design by resolving many of the issues encountered by designers using discrete solutions. Incorporating a SiC MOSFET and control circuitry optimized for auxiliary power supplies for industrial equipment in a single package significantly reduces the number of parts required when compared to the conventional designs (from 12pcs plus heat sink to a single IC). It also aids to minimizing both the component failure risk and the amount of resources required to develop systems using SiC MOSFETs. In addition, this product enables the improvement of power efficiency by 5% (and decreasing power loss by 28%). These features translate to dramatic reduction in size, improved reliability, and superior power savings in industrial applications.

ROHM is committed to developing not only power semiconductors such as SiC devices but also the ICs for controlling them, and to providing optimized solutions that contribute to greater energy savings and performance in industrial equipment.

SIC MOSFET applications

Key Features

The BM2SCQ12xT-LBZ series adopts a dedicated package that incorporates a 1700V SiC MOSFET along with the control circuitry (i.e. SiC MOSFET gate drive circuit) optimized for industrial auxiliary power supplies.

These leading technology AC/DC converter ICs deliver advantages that contribute to increase the demand of AC/DC converters with integrated SiC MOSFETs by improving the reliability, energy efficiency, and compactness of 400VAC industrial equipment.

  1. Breakthrough miniaturization is enabled by replacing 12 components and heat sink with a single package

ROHM’s latest products replace up to 12 components (AC/DC converter IC, 800V Si MOSFET x 2, Zener diode x 3, resistor x 6) and the heat sink with a single package, dramatically reducing the number of external parts required. In addition, the high withstand voltage and voltage noise resistance of the internal SiC MOSFET make it possible to reduce the size of components used for noise suppression.

  1. Development resources and design risks are reduced while providing multiple built-in protection functions that enable superior reliability
  1. SiC MOSFET performance is optimized to achieve dramatically improved power savings


Both internal SiC MOSFET and the built-in gate driver circuit optimized for this SiC MOSFET improve efficiency by as much as 5% over conventional Si MOSFETs (ROHM April 2018 study). Also, a quasi-resonant method is adopted for the control circuit that enables operation at higher efficiency and lower noise than conventional PWM systems, minimizing the effects of noise in industrial equipment.

Product Lineup

Part No. Supply Voltage Range Normal Operating Current


Burst Operating Current


Max. Operating Frequency


FB OLP VCC OVP Operating Temperature Range

15.0V to 27.5V


1700V (max.)

2000μA (typ.) 500μA (typ.) 120kHz (typ.) Auto Restart Latch -40°C to 105°C
BM2SCQ122T-LBZ Latch Latch
BM2SCQ123T-LBZ Auto Restart Auto Restart
BM2SCQ124T-LBZ Latch Auto Restart

Application Examples

AC-DC Converter Diagram

– General-purpose inverters

– AC servos

– PLCs (Programmable Logic Controllers)

– Manufacturing equipment

– Robots

– Industrial lighting (i.e. street lamps)

Optimized for auxiliary power supply circuits in 400VAC industrial equipment

Availability: Now (samples), May 2019 (OEM quantities).

Additionally, evaluation boards will be released later this year.