EXC-24CD121U Filters

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Common mode chokes are used in a variety of applications and to reduce unwanted common mode interference. The EXC-24CD121U common mode choke is a two-component common mode filter consisting of a coil and two capacitors. The type of common mode choke is often referred to as a EMI filter.

The EXC-24CD121U is a single-section common mode filter that operates from a frequency range of 10kHz to 200MHz. It is designed to reduce high frequency noise, typically from 50MHz to above. It is ideal for applications such as industrial, automotive, medical instrumentation, and power supplies.

The EXC-24CD121U utilizes an inductor (coil) and two capacitors to accomplish its filtering capabilities. The capacitors act as an essentially frequency-dependent resistor, while the inductor provides a DC path through which the common mode voltages are blocked. It is designed to have a higher impedance level at higher frequencies, thus allowing signals at lower frequency to pass through.

The EXC-24CD121U common mode filter is ideal for applications in which EMI suppression is required while allowing a low-level of passband EMI. In addition, the filter passes the differential, line to line EMI signals through, but rejects the common mode signals. This improves the signal integrity of the system and helps reduce EMI-induced false triggering.

The performance of the EXC-24CD121U depends on how it is used in the application. When the filter is used at the input side of the circuit, it should be placed as close as possible to the point of EMI entry. If used downstream, it should be located right the point where the interference is introduced, such as at the power source. When mounted close to the system, the EXC-24CD121U will be able to significantly reduce the common mode noise levels.

In order to improve the performance, the filter should have sufficient ground plane area to allow for high-frequency conductive-path layout. Also, the ground of the filter should be connected to a larger DC common node, such as the power source, to provide a low-impedance common path for the common mode currents. This ensures that the common mode currents are routed through the filter and not directly through the application circuit.

The EXC-24CD121U is very effective at rejecting high-frequency common mode interference. This allows more signal integrity to be preserved in the system, and helps reduce the risk of false triggers and other system problems. As a result, the EXC-24CD121U is a great choice for applications where common mode interference is an issue.

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