The development of next-generation vehicles for fully automated driving is gaining momentum, and the architecture of in-vehicle networks is beginning to undergo major changes.
In-vehicle Ethernet is attracting attention in automotive networks, and interfaces such as 100BASE-T1 (100Mbps) and 1000BASE-T1 (1Gbps), whose specifications are defined by the OPEN Alliance, are becoming popular. Recently, a new 10BASE-T1S (10 Mbps) has been added to this in-vehicle Ethernet, attracting a great deal of attention because of its ability to provide multi-drop connections.
This article introduces common-mode chokes and chip varistors that comply with OPEN Alliance specifications at the right time.

The demand for higher data rates at the edge has increased significantly. The adoption of cameras and video system has increased driven by the reduced footstep of these systems and their usage for safety, security and quality applications. Other systems like high-speed data logging devices, embedded web servers and monitoring systems require a timely data transmission.
In addition, the number of nodes in networks are constantly increasing therefore the desire to use an existing ecosystem is strong. Ethernet protocol and security layers as well as well-known installation, maintenance and management processes result in a lower Total Cost of Ownership (TCO) and a better Return on Investment (ROI) in the Network.
Industrial applications focus on a network speed of 10 Mbps as this should address the data rate and reach for most of the existing fieldbus applications. TDK offers an extensive lineup of various inductors for use in 10Base-T1L applications including common-mode chokes (CMCs), isolation inductors (Isolated Coupled Inductors) and differential mode inductors (DMIs).

In conjunction with advances in automotive technology, it is become necessary to quickly convey large volumes of data, and increasing the speeds of automotive networks has become increasingly important. And in conjunction with increases in the communication speeds of automotive networks, signal quality and EMCcountermeasures have become increasingly important.As a result, it is necessary to select common mode filters/chokesthat comply with the OPEN Alliance standards.This document describes TDK's ACT1210L series of common mode filter/choke for automotive Ethernet use.