ROHM Expands Its Lineup of Compact Market-Proven High Efficiency SBDs for Automotive Applications
The entire 178-product lineup contributes to lower power consumption, smaller size, and higher reliability in a wider range of applications

Willich-Münchheide, Germany, November 02, 2021 – ROHM has recently expanded its portfolio of Schottky barrier diodes by 24 new compact high efficiency models (12 RBR series and 12 RBQ series). These devices – 178 in total – are ideal for protection and rectification circuits in automotive, industrial equipment, and consumer applications.
(Fig. 1)

Diodes are commonly used in a variety of circuits for rectification and protection. Moreover, as lower power consumption is required in most applications, the adoption of SBDs – which are more efficient than other diodes – is on the rise. However, if VF is lowered to improve efficiency, IR which is inversely related to VF will become higher. This increases the risk of thermal runaway, so it is important to balance both VF and IR when selecting SBDs for circuit design.

In response, ROHM strengthened its lineup of SBDs that balances small size with low VF and IR characteristics demanded by the automotive sector. The market-proven RBR and RBQ series have been further expanded to include a lineup of compact high current, high voltage products that enable rectification and protection in a wider range of applications.

Introducing a new process allows ROHM to improve the chip performance of both series by 25% (VF of RBR series in particular) over ROHM’s conventional products. Furthermore, the RBR series features excellent low VF characteristics – key to improving efficiency and reducing loss. This makes them ideal for automotive applications as well as consumer electronics such as laptops where high efficiency is required. In fact, 12 of the products adopt a compact package (PMDE package (2,5 mm × 1,3 mm)) that reduces mounting area by 42% compared to existing products (PMDU package / SOD-123)

At the same time, the RBQ series delivers excellent low IR characteristics that enable stable operation in high temperature environments – significantly reducing the risk of thermal runaway which is a concern with SBDs. As such they are ideal for automotive powertrain applications and power supplies for industrial equipment that operate in high temperature environments. 12 new 100V products have been added to meet the need for higher voltages. And both series are qualified under the AEC-Q101 standard to ensure automotive-grade reliability.

Going forward, ROHM will continue to improve characteristics and efficiency of its semiconductor devices, from low to high voltages products while strengthening its distinctive lineup to further reduce power consumption and achieve greater miniaturization of applications.
(Fig. 2)

Product Lineup
(Fig. 3 + 4)

Application Examples
RBR Series
  • Automotive Applications such as LED headlamps and car accessories
  • Notebook PCs
RBQ Series
  • Industrial power supplies, Audio, Laptops, xEVs, Engine ECUs
  • Secondary rectification in AC/DC and DC/DC circuits
About ROHM Semiconductor

ROHM Semiconductor is a global company of 3.295 billion US dollars per March 31st, 2021 with 22,370 employees. The company develops and manufactures a very large product range from SiC Diodes and MOSFETs, Analog ICs such as Gate Drivers and Power Management ICs to Power Transistors and Diodes to Passive Components. The production of our high performing products is taking place in state-of-the-art manufacturing plants in Japan, Korea, Malaysia, Thailand, the Philippines, and China. LAPIS Technology (former OKI Semiconductor), SiCrystal GmbH and Kionix are companies of the ROHM Semiconductor Group. ROHM Semiconductor Europe has its Head Office near Dusseldorf serving the EMEA region (Europe, Middle East and Africa). For further information, please contact
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Date: 02.11.2021 14:00
Number: PR 24/21EN
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ROHM Expands Its Lineup of Compact Market-Proven High Efficiency SBDs for Automotive Applications

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Fig. 1

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Fig. 4
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