World-renowned semiconductor manufacturer ROHM (headquartered in Kyoto, Japan) has developed Nch power MOSFETs*3 with industry-leading ultra-low on-resistance*1 and an ultra-wide SOA range*2 for enterprise-grade high-performance servers and AI server power supplies.

New products total 3 models, including "RS7E200BG" (30V), ideal for the secondary side of the AC-DC conversion circuit and hot-swap controller (HSC)*4 circuit in 12V system power supplies for enterprise-grade high-performance servers, and "RS7N200BH (80V)" and "RS7N160BH (80V)", ideal for the secondary side of the AC-DC conversion circuit in 48V system power supplies for AI servers.

 

 

With advancements in advanced data processing technologies and the acceleration of digital transformation, the demand for servers supporting data centers is constantly increasing. In addition, the demand for AI processing servers with advanced computing capabilities is also growing, and is expected to continue to grow in the future. Since these servers require 24/7 operation (always powered on), the conduction losses caused by the on-resistance of multiple MOSFETs used in the power supply unit significantly impact overall system performance and energy efficiency.

Especially in AC-DC conversion circuits, conduction losses account for a relatively high proportion, so MOSFETs with low on-resistance are required. In addition, servers are equipped with hot-swap functionality, allowing for the replacement and maintenance of internal boards and storage devices while powered on. In such cases, large surge currents can occur within the server. ^*5 。

 

Therefore, a larger safe operating area (wide SOA range) is crucial for protecting both the server's internal components and the MOSFETs. To address this, ROHM has newly developed a DFN5060-8S package. Compared to previous package types, the chip usable area within the package has been increased, enabling the development of power MOSFETs with industry-leading ultra-low on-resistance and a wide SOA range. The new products significantly contribute to improving the efficiency and reliability of server power supply circuits.

 

The new products all use the newly developed DFN5060-8S (5.0mm×6.0mm) package. Compared to the previous HSOP8 (5.0mm×6.0mm) package, the usable chip area within the package has increased by approximately 65%. This allows the new products to achieve industry-leading ultra-low on-resistance with a 5.0mm×6.0mm package size. The on-resistance of the 30V product "RS7E200BG" is only 0.53mΩ (Typ.), and that of the 80V product "RS7N200BH" is only 1.7mΩ (Typ.), significantly contributing to improved efficiency of server power supply circuits.

 

In addition, by optimizing the design of the clamp shape inside the package, heat dissipation performance has been improved, while also improving the SOA range, which helps ensure the reliability of the application products. In particular, the 30V product "RS7E200BG" has an SOA range exceeding 70A (conditions: pulse width = 1ms, V _DS =12V), double the SOA range of previous HSOP8 packaged products under the same conditions, achieving an industry-leading high SOA range with a 5.0mm×6.0mm package size.

 

Mass production of the new products has begun at a rate of 1 million units per month (sample price: JPY 710/unit, excluding tax). The front-end production base is ROHM Co., Ltd. (Shiga Plant, Japan), and the back-end production base is OSAT (Thailand). In addition, sales of the new products have begun through e-commerce, and they Oneyac 、 Sekorm and other e-commerce platforms.

 

ROHM plans to gradually achieve mass production of power MOSFETs that also support AI server hot-swap controller circuit applications by 2025. In the future, ROHM will continue to expand its product lineup, contributing to improved efficiency and reliability of application products.

 

Product Lineup

 

About EcoMOS™ brand

EcoMOS™ is ROHM's brand of Si power MOSFETs, ideal for applications in the power device field with high energy-saving requirements. The EcoMOS™ product lineup is extensive and has been widely used in home appliances, industrial equipment, and automotive applications. Customers can select products from the lineup based on application needs, using various parameters such as noise performance and switching performance.

 

・ EcoMOS™ is a trademark or registered trademark of ROHM Co., Ltd.

 

Application Examples

・ Enterprise-grade high-performance servers AC-DC conversion circuit and HSC circuit for 12V system power supplies

・ AC-DC conversion circuit for 48V system power supplies in AI (artificial intelligence) servers

・ Industrial equipment 48V system power supply (fan motors, etc.)

E-commerce Sales Information

Sales start date: From February 2025

E-commerce platforms: Oneyac, Sekorm

New products will be gradually launched on other e-commerce platforms.

Product model numbers: RS7E200BG, RS7N200BH, RS7N160BH

Sold in units of 1

Glossary of Terms

*1) On-resistance (R _DS(on) )

The resistance between the drain and source when the MOSFET is turned on. The lower this value, the lower the operating loss (power loss).

*2) SOA (Safe Operating Area) range

The voltage and current range within which the component can operate safely without damage. Operating outside this safe operating area may lead to thermal runaway or damage. This needs to be considered, especially in applications where surge currents and overcurrents may occur. SOA range.

*3) Power MOSFET

A type of MOSFET used in power conversion and switching applications MOSFET. Currently, Nch MOSFETs, which are turned on by applying a positive voltage to the gate relative to the source, are the mainstream product. Compared to Pch MOSFETs, they have the advantages of low on-resistance and high efficiency. Due to their ability to achieve low loss and high-speed switching, they are widely used in power supply circuits, motor drive circuits, and inverters.

*4) Hot Swap Controller (HSC)

A specialized IC (integrated circuit) with a hot-swap function that allows components to be inserted or removed while the device's power supply system is operating. It plays an important role in controlling the surge current generated when inserting components and protecting the system and connected components.

*5) Inrush Current

A large current that momentarily flows exceeding the rated current value when an electronic device is turned on. Because it puts a load on the components in the power supply circuit, controlling the surge current prevents equipment damage and improves system stability.