ROHM expands its line-up of high efficiency SBDs for automotive applications

ROHM has expanded its portfolio of Schottky barrier diodes with the addition of 24 new compact high efficiency models (12 RBR series and 12 RBQ series).

These devices - there are 178 in total - are intended for protection and rectification circuits in automotive, industrial equipment, and consumer applications.

Diodes are commonly used in a variety of circuits for rectification and protection and as lower power consumption is required in most applications, the adoption of SBDs, which are more efficient than other diodes, is increasing. 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 has strengthened its line-up of SBDs balancing small size with low VF and IR characteristics that are demanded by the automotive sector. The RBR and RBQ series have been further expanded to include a line-up of compact high current, high voltage products that enable rectification and protection in a wider range of applications.

Introducing a new process has allowed ROHM to improve the chip performance of both series by 25% (VF of RBR series in particular) over ROHM’s conventional products. In addition, the RBR series features excellent low VF characteristics – key to improving efficiency and reducing loss. This makes them suitable for automotive applications as well as consumer electronics such as laptops where high efficiency is required. According to ROHM, 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)

The RBQ series also delivers low IR characteristics that enable stable operation in high temperature environments and significantly reducing the risk of thermal runaway which is a concern with SBDs. As such they are suitable for automotive powertrain applications and power supplies for industrial equipment that operate in high temperature environments.

Both series described here are qualified under the AEC-Q101 standard to ensure automotive-grade reliability.