What are Common Mode Chokes?
In the transmission system, noise is classified in two ways: one is differential mode noise and the other is common mode noise. A common mode signal (noise) is an unwanted signal as it “carries” no information. A common mode choke is designed to clean common mode noise (signals) generated from either a signal line or power line circuit.
How do Common Mode Chokes Work?
Common mode chokes are used to suppress common mode noise. When a common mode noise enters a circuit with a common mode choke installed, the flux generated by the D+ signal and that by the D- signal enhance each other, generating high impedance and preventing common mode noise from passing.
How to Choose the Right Mode Chokes
Firstly, understand the “problem frequency” and then check whether the key features (like operating temperature, quality requirements), and key parameters and dimensions (like rated voltage, rated current, and Inductance/Impedance) can meet requirements or not.
Common Mode Chokes
Benefits of Laird Performance Materials’ Common Mode Chokes
Constructed from ultra-thin mixtures of iron, nickel and zinc oxides, Laird Steward ferrite common mode chokes are characterized by their size, light weight, low cost, and high reliability. They provide superb EMI reduction while remaining open to normal circuit operation.
Other benefits include:
- High-precision winding construction with spacer or precise multi-layer construction; you improve isolation in offending circuits and ensure consistent reliability
- Through-hole and surface-mount installation available upon customer request
- Designs available with ferrite, iron and alloy composite, or ultra-thin nanocrystalline upon request
- Various operating temperatures and current match capabilities over a broad range of inductance values
- Custom designs possible
