New Common Mode Filter Enhances Automotive Ethernet 10BASE-T1S

TDK has introduced a groundbreaking common mode filter designed specifically for automotive Ethernet 10BASE-T1S, achieving Class IV parasitic capacitance in the OPEN Alliance EMC test specification.

The TDK ACT1210E Series, measuring 3.2 x 2.5 x 2.5 mm, is now in mass production for automotive Ethernet communication 10BASE-T1S. The filter's high reliability is ensured through laser bonding winding wires to metal terminals, making it compliant with AEC-Q200 Rev. D standards.

The ACT1210E-131-2P-TL00 filter stands out by reducing line-to-line capacitance by approximately 30% compared to traditional products. In the OPEN Alliance EMC test specification, it achieves Class IV status with the lowest parasitic capacitance in the industry. The common mode inductance at 100 kHz is 130 µH, with a rated current of 70 mA.

The communication circuit of 10BASE-T1S includes various components such as PHY, ESD suppression devices, and common mode filters, each contributing to its own capacitance. As total capacity increases, signal wave shape turbulence can occur, leading to disruptions in telecommunications. Engineers must carefully select components with low capacitance to mitigate these issues.

To optimize S-parameters, the filter utilizes a proprietary structure and optimized materials to minimize signal distortions caused by capacitance and effectively suppress common mode noise. The high-precision automatic winding technology ensures stable quality and reliability of the filter.