Murata Releases Common Mode Choke Coil for In-Vehicle SerDes PoC Interface

By Tiera Oliver

Associate Editor

Embedded Computing Design

June 01, 2021


Murata Releases Common Mode Choke Coil for In-Vehicle SerDes PoC Interface
(Image courtesy of Murata)

Murata released the latest automotive common mode choke coils used to suppress noise for high-speed interfaces.

The DLW21SH391XQ2 and DLW21PH201XQ2 common mode choke coils from Murata use Serializer/Deserializer (Ser/Des) on Power Over Coax (PoC).

Various sensors (vehicle-mounted cameras, LiDAR, radars, etc.) are equipped to vehicles to establish self-driving car technologies. Since SerDes is often used on image data transmission interfaces, this has led to the application of PoC which performs data and power transmission on single coaxial cables in order to reduce the amount of cables. Per the company, since a large current flows through compared to conventional differential interfaces (several tens of mA currents), Murata developed these products which are capable of withstanding large currents such as 300 mA and 500 mA.

Since this technology requires higher current compared to conventional differential interfaces (typically tens of mA), the latest Murata DLW21 products are designed to handle 300mA to 500mA.

Since each sensor is compact, it is difficult to increase ground (GND) patterns on PCB, and noise issues may occur. By inserting these 2.0 × 1.2 mm/0805 inch products between the data transmission line and the GND line, users can expect noise suppression effects even with their compact size. 

Mass production started in May.

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Tiera Oliver, Associate Editor for Embedded Computing Design, is responsible for web content edits, product news, and constructing stories. She also assists with newsletter updates as well as contributing and editing content for ECD podcasts and the ECD YouTube channel. Before working at ECD, Tiera graduated from Northern Arizona University where she received her B.S. in journalism and political science and worked as a news reporter for the university’s student led newspaper, The Lumberjack.

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