Chip ferrite beads solve wide band noise including high-frequency range issues

Murata's new BLM21HE series of chip ferrite beads offer the unique capability of providing vehicles with power line noise suppression solutions that display high impedance at high-frequency levels.

Even at 1GHz, members of the series will generally attain impedance values of 850-Ohm (in case of BLM21HE802***). These components are key in addressing the signal integrity expectations of next-generation vehicle designs where high-current power lines will be close to high-frequency communication-related functions. Amongst the places where these components will be deployed is in wireless battery management system (wBMS) infrastructure and V2X communication systems.

Including wBMS and V2X functions means that noise suppression at higher frequencies is becoming essential. Until now, noise suppression solutions suitable for deployment in high-current circuits have not been applicable concerning sufficiently suppressing high-frequency noise. The 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, these chip ferrite beads' low DC resistance values result in minimal power loss, thereby improving efficiency and requiring less thermal management to dissipate any generated heat.

The series chip ferrite beads are offered in versions that support operational temperatures between -55C to +125C and -55C to +150C. They are supplied in compact 0805" size (2mm ×1.25mm × 1.25mm).