Automakers are incorporating more multifunctional capabilities into automobiles as they seek to make autonomous driving a reality. Electronic control units (ECUs) for advanced driver assistance systems are consuming more power, and the latest trend is toward ECU integration—installing an ECU close to the engine room or other working part.
For these reasons, the number of electronic devices and components built into cars these days is on the rise, and the reliability of the electronic components used in the electronics is having a growing impact on the reliability of the vehicle overall.

If communication waves from cellular or Wi-Fi sources interfere with and intrude into microphone lines for smartphones or other devices, some of their components will become noise components in audible bands known as "TDMA noise", and may be emitted from speakers as unpleasant sound. Countermeasures which implement combinations of TDK's noise suppression filters and ESD Notch Filters can not only demonstrate outstanding effectiveness at suppressing TDMA noise with no effect on signals, but can also provide a variety of other benefits such as improving cellular or Wi-Fi communication reception sensitivity, and providing countermeasures against ESD (electrostatic discharge).

The shunt-through connection is a mounting method in which a component is connected in parallel with the power line, and produces an excellent effect for decoupling of the power line. This article will explain each mounting method and their advantages in detail.

The YFF-AC/AH series 3-terminal feed-through filters offer excellent performance for decoupling of the power lines of automotive electronics.

The radiation noise countermeasure in power lines of in-vehicle electronic equipment provided by TDK's YFF series 3-terminal filters is introduced in the following, based on case examples of evaluation and measurement.

A capacitor is the most basic electronic component for noise suppression in power lines of electronic equipment. A capacitor has a characteristic that, the higher the frequency, the easier the current passes through it, and when a power line is connected to the ground through a capacitor, high-frequency noise is bypassed to the ground and separated.

Ensure voice quality, Prevent degradation of reception sensitivity (self-poisoning), Suppress harmonic distortion in Class-D amplifiers in Noise Suppression Filters for Audio Lines