ACT Common Mode Filters & Chokes TDK ACT Common Mode Filters and Chokes are designed to withstand high temperatures of up to 125°C or 150°C. These TDK filters and chokes are used for vehicular devices that require compatibility with high temperatures. The ACT1210 series is compact with characteristics equivalent to ACT45B filters. Applications for ACT45B include CAN buses, modems, ISDNs, and more. Applications for both the ACT1210 and ACT1210R include CAN bus and FlexRay systems. The ACT1210G filter conforms to the standards of the OPEN Alliance (one-pair Ethernet) for 1000BASE-T1. The ACT1210E common mode filter is 3.2mm x 2.5mm x 2.5mm in size and is designed for automotive Ethernet 10BASE-T1S. The ACT32P series is compliant with AEC-Q200 qualifications and ideal for power CMC applications.