Chip Ferrite Beads for Automotive Applications up to 175°C



Murata has introduced the BLM18KN_EH series of chip ferrite beads for noise suppression in power lines at temperatures up to 175°C. Target automotive applications include engine and transmission electronic control units (ECUs) and turbo motor controllers. The components also meet AEC-Q200 qualification requirements. 

The new line is available in a 0603 size with dimensions of 1.6 mm × 0.8 mm. The devices have low direct current resistance (Rdc) making it compatible with large currents and low power consumption. The solution also delivers a wide operating temperature range and a rated current from 740 mA to 4,000 mA (−55°C to +125°C), 490 mA to 2,600 mA (+150°C), and 10 mA (+175°C). The typical impedance at 100 MHz ranges from 26 Ω to 1000 Ω. 

By selecting a ferrite material that does not lose its magnetic properties at high temperatures, combined with an electrode to suppress temperature-related deterioration, the BLM18KN_EH series conforms to the AEC-Q200 standard for use up to 175°C. This greatly improves design freedom allowing for the reduction of electromatic interference in high temperature areas that were once not possible. An additional benefit of the new solution is its low DC resistance, which reduces heat generated and increases efficiency. 

For more information about the series, including specifications, samples, and purchase information, visit here.