For high-speed data line applications, common mode noise can be effectively reduced by using SMD common mode choke series such as MM1608 or MM2012. These series feature industry-standard dimensions, a 1:1 impedance ratio, and high working frequencies of up to 1.2GHz, with a standard IL of 0.8db. They are suitable for various applications, including USB2.0, HDMI 2.0, USB 3.0 IEEE 1394, and LVDS. The entire series is RoHS, REACH compliant, and halogen-free.

However, the SMD common mode choke for the signal line will use the nickel-zinc core to provide high operating frequency and high impedance. Most of the signal will transit via a LAN cable connecting these ECUS. To against the noise and make components suitable for such an environment, noise suppression has become crucial for safety reasons. Common-mode chokes are frequently used to suppress electromagnetic compatibility (EMC) and increase system reliability. The MM series could use to filter the common mode noise from a broad range of frequencies and could provide low dc resistance and higher current carry capacity. The common-mode choke is not only available for automotive applications, but the other general industrial applications also that need the higher quality/characteristic.

To achieve a higher rated current, we also have the through hole common mode choke, which utilizes the flat wire. Such a common mode choke offers lower dc resistance, higher efficiency, and space saving solution.

Perfect replacement to TDK/Wurth/Bourns

Power line common mode choke of SMM series from Coilmaster could replace the TDK, Wurth or Bourns directly with same PCB pattern and characteristic. But with more competitive price and better lead time.

SMM4720 series is cross to ACM4520 series
SMM7060 series is cross to ACM7060 series
SMM9070 series is cross to ACM9070 series
SMM1211 series is cross to ACM1211 series
SMM0905 series is cross to 74422 series

Operating temperature for power line common mode choke is –40°C to +125°C (Including self-temperature rise). For the power line choke, they are designed to carry high current and eliminate the common mode noise from AC line in a broad range of frequencies. The isolation on the power line common mode choke normally is up to 2000Vrms.

Function of common mode choke

Unshielded electronics, inverters, or other unwanted signals always result in common mode noise current and usually common mode choke is an excellent choice to filter/suppress these unwanted noises in electrical circuits to avoid the interference problem. The common-mode choke works like the filter in the circuit, it has two windings with a 1:1 turn ratio and could work in both normal and differential mode. As a common mode, the current will go through the two windings in the same direction. Hence, the magnetic flux has boosted each other, which means the inductance will be generated to impede common mode current. However, the current travels from one line from the source to the load and returns in the opposite direction as the complete circuit. The magnetic flux is canceled, and the current could pass directly, this is the differential mode.

Features

• Effective in high frequency noise suppression.
• Without degrading the signal.
• Suppress the common mode noise on electronics products
• Excellent common mode impedance at high frequency to suppress the noise.