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Chokes are one of the more common electronic components used to block high-frequency alternating currents, yet allow low-frequency direct currents to pass through in electrical circuits.
Common Mode Chokes (also refered to as "CM Chokes") are a type of choke that get their name from their ability to impede common mode currents. They differ from many other chokes, such as differential mode in that they typically use two coils wound around a single core instead of just one. Their primary purpose is to eliminate potential malfunctions in electronic devices and interference in power supply lines -- specifically radio frequency interference (RFI) and electromagnetic interference (EMI).
Selecting or designing the right CM choke takes careful consideration and can depend heavily on the application for which it is intended.
For more information, contact our team of engineers or check out our white paper: "Understanding Common Mode Noise".
Our line of common mode choke products are available in both surface mount and through hole toroidal construction types with a wide range of inductance. While our CM chokes are ideal for a variety of common mode noise filtering applications, we offer custom common mode choke design services as well. Use our product table below to search through our complete line of common mode choke products.