Murata Manufacturing introduced the wire-wound common mode choke coil (CMCC) DLW32SH101XF2, saying it is the world’s first CMCC to support DCMR Class 3, fulfilling the IEC62228-3 requirement for use in CAN FD next-generation automotive networks

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 1 Mbps, is being replaced with the faster CAN FD.

The new product delivers the high performance and reliability required for CMCCs used in CAN FD networks while realizing a small size with a unique wire-wound structure. It operates over -40 to +125ºC, is AEC-Q200*8 compliant, and has dimensions of 3.2 mm × 2.5 mm.

To ensure stable communication in automotive networks, it is essential to implement ongoing 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 reportedly 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 claims to deliver the highest level of DCMR.