New BLM18DN_SH Noise Filter Ferrite Beads Supports Large Currents up to 1400 mA

Press Release Summary:

  • Designed for automotive networks using power over coaxial (PoC) with high impedance and high frequencies
  • Internal electrode limits the size to 1.6 mm x 0.8 mm (1608) while offering a maximum DC resistance of 0.12 Ohm
  • Ideal for designing the Bias Tee circuits required for PoC implementation and applications

Original Press Release:

New Filter Ferrite Bead Designed for High Frequency, High Current Automotive Applications

Hoofddorp, Netherlands: Murata announce the availability of their new BLM18DN_SH series of noise filter ferrite beads. The new devices are specifically designed for automotive networks using Power over Coaxial (PoC) with high impedance, high frequencies and supporting large currents, up to 1400 mA.

As vehicles become more complex and sophisticated and especially as a result of increased image sensing, data communication needs within vehicles have increased significantly. Multiple protocols exists including CAN, LIN, FlexRay and Ethernet and the wiring, along with the associated power cabling, has increased in weight to the point it is now an issue. The transition towards PoC is addressing this by transmitting data on a single coaxial cable that is also able to carry the power.

However, systems such as Advanced Driver Assistance Systems (ADAS) and In-Vehicle Infotainment (IVI) use a 1.5 GHz band GPS signal that creates noise that can significantly affect data transmission at 2.4 GHz. To resolve this, a high impedance noise filter that can carry large currents and remain effective into the GHz band is needed. Murata’s existing BLM18GG series supports the frequency range required but is limited to 200 mA making it unsuitable for PoC implementations.

The new BLM18DN_SH series uses a unique Murata developed internal electrode that limits the size to 1.6 mm x 0.8 mm (1608) while offering a maximum DC resistance of 0.12 Ohm and maximum rated current of 1400 mA while supporting frequencies at 1 GHz. This is the first product to offer this performance in such a compact size.

The four devices in the new series are ideally suited for designing the Bias Tee circuits required for PoC implementation and applications which will need the capability of wide frequency coverage due to their performance, small size and ability to operate at temperatures up to 125°C. The devices are AEC-Q200 compliant, making system approvals easier.

For further information and reader enquiries:

Dunya Kamil, Murata Electronics Europe B.V., Wegalaan 2, 2132 JC, Hoofddorp, The Netherlands

Tel: +31 (0) 23 56 98 456

Fax: +31 (0) 23 56 98 361




Agency contact:

Rachel Sandeman, Publitek Limited, 18 Brock Street, Bath, BA1 2LW, United Kingdom

Tel: +44 (0) 2038 136425



About Murata

Murata is a leading manufacturer of electronic components, modules, and devices. The complete range includes ceramic capacitors, resistors/thermistors, inductors/chokes, timing devices, buzzers, sensors and EMI suppression filters. Whilst the company is known as a global ceramic capacitor manufacturer, it is also a world leader in Bluetooth® & WiFi™ Modules, board-mount DC-DC converters and is a key manufacturer of standard and custom AC-DC power supplies.

Established in 1944, Murata is headquartered in Japan and has European offices in Finland, France, Germany, Hungary, Italy, the Netherlands, Spain, Switzerland and the UK.

For more information on Murata, please visit: You can also follow us on Twitter @MurataEurope or LinkedIn, or join us on Facebook at

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