The SFR series contributes to long-term reliability by achieving high sulfur resistance.

ROHM Co., Ltd. announced that it has developed the SFR series of anti-sulfur chip resistors, which are optimal for applications in environments prone to exposure to sulfur components, such as automobiles, industrial equipment, and communication infrastructure.

Various forms of sulfur components exist in the air, such as automobile exhaust gases and sulfur gases. These sulfur components adsorb onto metal surfaces and gradually cause sulfidation. In the case of silver, which is commonly used in electronic components such as resistors, long-term contact with sulfur components can lead to sulfidation of the electrodes, causing fluctuations in resistance and potentially resulting in application failure. Recently, there has been an increasing demand for sulfur resistance in applications such as automobiles and industrial equipment to improve long-term reliability and safety.



Generally, silver is used for the internal surface electrodes and side electrodes of chip resistors. However, since silver sulfides easily, there were issues with long-term reliability when used in environments prone to exposure to sulfur.

The company stated that this series has succeeded in significantly improving sulfur resistance performance by adopting ROHM's proprietary structure and protective materials in the electrode section. Accordingly, it contributes to improving the long-term reliability and safety of applications used in environments susceptible to exposure to sulfur components, such as automobiles and industrial equipment.


<Comparison of Sulfate Resistance>

Mass production of this product began in 2015 and is currently being carried out at a production capacity of 50 million units per month. ROHM plans to continue expanding its lineup of chip resistors with improved sulfur resistance performance and contribute to enhancing the long-term reliability and safety of each application.