New Chip Ferrite Beads Deliver High-current and High-frequency Noise Suppression in Automotive Systems

Murata has introduced the new BLM21HE series of chip ferrite beads which have the unique capability of providing vehicles with power line noise suppression solutions that exhibit high impedance at high-frequency levels. Even at 1GHz, this series products attain impedance values of 850Ω which makes them pivotal in addressing the signal integrity expectations of next-generation vehicle designs, where high current power lines will be in close proximity to high-frequency communication-related functions. These components can be deployed in wireless battery management system (wBMS) infrastructure and vehicle-to-vehicle (V2X) communication systems.

This series has a wide band from 100MHz to 1GHz and has high impedance, so it is possible to suppress high frequency noise in addition to conventional noise frequencies. This will prevent high-current power lines that automotive OEMs are transitioning towards from impacting on vital data being transmitted. Furthermore, the low DC resistance values of these chip ferrite beads result in minimal power loss, thereby improving efficiency and meaning less thermal management is needed to dissipate any generated heat.

The BLM21HE series chip ferrite beads from Murata are now available in versions that support operational temperatures between -55°C to +125°C and -55°C to +150°C. They are supplied in compact 0805-inch size (2.0mm ×1.25mm × 1.25mm).