Low leakage 200V SBD Schottky Barrier Diode for automotive power supplies

Low leakage 200V SBD Schottky Barrier Diode for automotive power supplies

New Products |
By Nick Flaherty

Rohm has launched a family of 200V ultra-low IR Schottky Barrier Diodes (SBD) optimized for automotive applications including powertrains and xEVs.

The RBxx8BM/NS200 expands on the RBxx8 lineup of SBDs enabling high temperature operation that have already been proven in the automotive market in Japan. The SBD family offers ultra-low leakage current (IR) characteristics to achieve high withstand voltage of 200V. Replacing Fast Recovery Diodes (FRD) and rectifier diodes typically used in vehicle systems with the SBDs make it possible to improve forward voltage (VF) characteristics significantly, typically 11 percent lower than conventional FRDs. This reduces application power losses and allows smaller package designs by reducing heat generation, contributing to greater space savings.

In recent years, the technological trend in Drive Systems for 48V mild hybrids is mechanical integration, in which the motor and peripheral circuits are combined into a single module. This demands high efficiency and high voltage SBDs capable of stable operation at high temperatures. At the same time, higher voltage SBD devices are required in systems utilizing conventional 150V components to increase functionality and reliability.

ROHM has been offering the RBxx8 lineup of ultra-low IR SBDs that withstand up to 150V compatible with high temperature automotive environments. This latest series adds 200V models to meet the new automotive requirements. ROHM will continue to enhance its lineup and contribute to lower power consumption and greater space savings in a wide range of applications in the industrial and automotive fields.

The higher efficiency means SBDs are expected to replace conventional rectifier diodes and FRDs in automotive power supplies exposed to high temperature. However, one drawback of SBDs is degraded IR characteristics at higher operating temperatures that can lead to thermal runaway, requiring products that provide stable operation at higher temperatures.

The RBxx8 series uses a barrier metal optimized for high temperature that significantly improves the IR characteristics. This provides the safe operation at high temperatures in automotive and industrial applications, eliminating the possibility of thermal runaway.

Rohm is currently developing medium power packages, with plans to decrease mounting area by as much as 71 percent by replacing 5.9mm × 6.9mm FRDs with compact 2.5mm × 4.7mm products.

The SBD family is available now

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