Noise Suppression (EMI/EMC Suppression) for Automotive Devices

Numerous achievements in automotive devices Murata's noise suppression solutions

Starting with the commercialization of the three-terminal capacitor as the world's first dedicated noise suppression product, Murata Manufacturing Co., Ltd. has earned the trust of customers over many years by developing various noise suppression products, helping to disseminate noise suppression technology, and providing noise suppression services.

This page introduces Murata Manufacturing's diverse knowhow and achievements in noise suppression, as well as noise suppression products such as ferrite beads, LC composite filters, and common mode choke coils which are all well suited to automotive devices.

Reference block diagram View our lineup of automotive products View technical information

Murata Icon X Noise suppression products
Reference block diagram / Part adoption example

Murata's noise suppression products have been adopted for use in various automotive applications, from ABS and ECU automotive powertrains/safety equipment to car audio, car navigation system, and other automotive infotainment devices.

Please refer to the following typical example of target products where these are to be used for several application of automotive devices. 

These are just a little bit of representative adoption example and application devices which are now aiming to focus. To check the reference block diagram and a part adoption example, please click the following application name.


Reference block diagram / Part adoption example Sample


Target area

In-Vehicle Infotainment
Block diagram((PDF) Differential signal lines
Single ended signal lines
Analog/digital video lines
Analog/digital audio lines
Power lines

Block diagram(PDF)
Block diagram((PDF)
xEV Power Control Unit
Block diagram((PDF)

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Murata Icon X Broad lineup of automotive noise suppression components

Automotive ferrite beads Automotive three-terminal capacitors Automotive common mode choke coils
Compact noise suppression filters that do not require a ground connection. Optimal for minor noise suppression.

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Capacitors with a three-terminal structure developed for noise suppression. Noise suppression performance that is superior to ferrite beads.

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Filters that efficiently suppress the problem of common mode noise which easily occurs in cables. Optimal for noise suppression in high speed differential transmission lines.

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 Automotive LC composite filters  Automotive filters with a varistor function Automotive block-type filters
EMI suppression filters which combine a capacitor with an inductor. Little impact on the signal waveform in high speed signal lines.

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EMI suppression filters which combine a capacitor with a varistor. Able to simultaneously absorb surge voltages and suppress EMI noise.

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High performance noise filter that supports large currents and provides noise suppression across a broad frequency band in one product.

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 Automotive impedance filters
Filters that suppress noise at a specific frequency in audio lines, etc.

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Murata Icon X Technical information and email newsletter

Example of noise suppression in the power circuits of devices mounted in vehicles
The power circuits use a switching system that increases efficiency, but is also a source of problematic noise. Noise suppression measures for the power circuits (DC-DC converter) of devices mounted in vehicles are described below.

for automotive LANs Suppression of noise in CANs using common mode choke coils
For automotive LANs Suppression of noise in CANs using common mode choke coils
Introduce noise countermeasure example for CAN line which is used for automotive communication network.

Examples of actions taken to comply with the CISPR25 standard governing radio emissions (noise emitted) from devices mounted in vehicles
There are many kinds of problematic noise that are emitted from the devices installed in vehicles.
The examples of the actions taken to suppress noise described here deal with the noise that is radiated from the USB signal cables.

EMI Suppression Filters (EMC and Noise Suppression) >


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