Chip ferrite beads solve wide band noise, claims Murata
The latest noise suppression advance from Murata is the BLM21HE series of chip ferrite beads which use the structural simulation techniques to provide automotive vehicles with power line noise suppression that exhibits high impedance at high frequency levels, said the company.
The ferrite beads will typically attain impedance values of 850 Ohm, even at 1GHz, claimed the company, making 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. Typical applications for these components to be deployed will be in wireless battery management system (wBMS) infrastructure and vehicle-to-vehicle (V2X) communication systems.
Including these functions into vehicles means that noise suppression at higher frequencies is now becoming essential, observed Murata. Until now, noise suppression solutions suitable for deployment in high-current circuits have not been applicable in relation to sufficiently suppressing high-frequency noise. The BLM21HE series has a wide band from 100MHz to 1GHz and high impedance enabling it to suppress high frequency noise in addition to conventional noise frequencies. In automotive design this means that in vital data transmission will not be affected by high current power lines. Furthermore, the low DC resistance values of these chip ferrite beads results in minimal power loss, improving efficiency and meaning less thermal management is needed to dissipate any generated heat.
The BLM21HE series chip ferrite beads from Murata are available in versions that support operational temperatures between -55 to +125 degrees C and -55 to +150 degrees C. They are supplied in compact 0805 inch size (2.0 x 1.25 x 1.25mm).
