Common mode choke coils optimized for CAN FD vehicle networks

Murata has introduced the wire-wound common mode choke coil (CMCC) DLW32SH101XF2, the first CMCC to support DCMR Class 3, fulfilling the IEC62228-3 requirement for use in CAN FD next-generation automotive networks. Mass production of this product will begin in August 2019.

In the automotive industry, technologies that control basic automobile behavior are advancing rapidly with the aim of realizing safer and more comfortable driving. In keeping with this trend, faster automotive networks are required for connecting ECUs, sensors, and motors, with the result that conventional CAN, which transmits data at a rate of up to 1Mbps (megabits per second) is being replaced with the faster CAN FD.

The new product draws on Murata’s CMCC design and manufacturing know-how to deliver the high performance and reliability required for CMCCs used in CAN FD networks while realizing a small size thanks to the company’s unique wire-wound structure.

Highlights
・Supports DCMR Class 3, fulfilling the IEC62228-3 requirement for CMCCs used in CAN FD
・Operating temperature range : -40 to +125ºC
・AEC-Q200 compliant
・The industry’s smallest size (3.2mm✕2.5mm)

In automotive networks, in order to ensure stable communication, it is essential to implement thoroughgoing measures to reduce noise from many sources within the vehicle. In transitioning from CAN to the faster CAN FD, more stringent noise-reduction measures are required. Conventional CMCCs for CAN support DCMR Class 1 or, in the case of high-precision products, Class 2.

By minimizing the difference in characteristics between the two coils comprising the CMCC and controlling DCMR degradation, this product successfully supports DCMR (Ssd21, Ssd12) Class 3, which is required for CMCCs used in CAN FD according to IEC62228-3, the CAN specification defined by the IEC. Particularly in the low-frequency band in the range of several hundred kilohertz and higher, the new product delivers the highest level of DCMR.