Common mode Chokes
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.
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
Image Gallery
Common mode Chokes Series
| Product image | Product name | Filter Type 1 | Impedance (Ohm) at 100 MHz | Impedance (Ohm) at 10 MHz | Inductance (µH) at 100 KHz | Rated Current (A) Max | Rating Voltage Max (VDC) | Rating Voltage Max (Vrms) | DCR (Ω) Max | Width(mm) | Technical datasheet |
|---|---|---|---|---|---|---|---|---|---|---|---|
 | CM8663 Series | Power Line | 160.00 | 82.00 | 0.00 | 16.00 | |||||
 | CM4732 Series | Power Line | 300.00 | 8.00 | 0.01 | 8.00 | |||||
 | CM3440 Series | Power Line | 170.00 | 20.00 | 0.00 | 10.00 | |||||
 | CM5441 Series | Power Line | 160.00 | 70.00 | 0.00 | 10.00 | |||||
 | CM5740 Series | Power Line | 100.00 | 173.00 | 20.00 | 0.00 | 10.00 | ||||
 | CM3421 Series | Power Line | 60.00 | 15.00 | 0.00 | 6.00 | |||||
 | CM1210C Series | Signal Line | 550.00 | 11.00 | 0.30 | 0.40 | 2.00 | ||||
 | CM1206 Series | Signal Line | 160.00 | 0.34 | 0.40 | 2.00 | |||||
 | CM2722 Series | Power Line | 80.00 | 5.00 | 0.02 | 6.00 | |||||
 | CM3032 Series | Power Line | 300.00 | 8.00 | 0.01 | 8.00 | |||||
 | CF0805 Series | Signal Line | 90.00 | 0.40 | 0.40 | 1.00 | |||||
 | CM4440 Series | Power Line | 120.00 | 20.00 | 0.00 | 10.00 | |||||
| | CH0805 Series | Signal Line | 90.00 | 0.40 | 0.30 | 1.00 | |||||
| | CM0805 Series | Signal Line | 90.00 | 0.40 | 0.30 | 1.00 | |||||
 | CC2824 Series | Signal Line | 5.00 | 0.12 | 0.10 | 6.00 | |||||
 | CM1210A Series | Signal Line | 200.00 | 0.07 | 5.50 | 2.00 | |||||
 | CM2545 Series | Power Line | 170.00 | 10.00 | 0.01 | 11.00 | |||||
 | CMX1616 Series | Power Line | 704.00 | 33.00 | 2.30 | 40.00 | |||||
 | CM1812B Series | Signal Line | 2800.00 | 51.00 | 0.23 | 1.00 | 3.00 | ||||
 | CC1812 Series | Signal Line | 51.00 | 0.20 | 0.50 | 4.00 | |||||
 | CF0504 Series | Signal Line | 90.00 | 0.30 | 0.60 | 1.00 | |||||
 | CM6050 Series | Power Line | 500.00 | 3.10 | 0.02 | 5.00 | |||||
 | CM1812A Series | Signal Line | 200.00 | 0.10 | 4.50 | 3.00 | |||||
 | CM1812 Series | Signal Line | 2800.00 | 1900.00 | 0.20 | 0.50 | 4.00 | ||||
 | CM1210B Series | Signal Line | 2600.00 | 51.00 | 0.20 | 0.70 | 2.00 | ||||
 | CM4545 Series | Power Line | 130.00 | 10.00 | 0.01 | 11.00 | |||||
 | CMX1211 Series | Power Line | 68.00 | 50.00 | 0.56 | 19.00 | |||||
 | CM6032 Series | Power Line | 300.00 | 8.00 | 0.01 | 8.00 | |||||
 | CM2021 Series | Power Line | 33.00 | 15.00 | 0.00 | 6.00 | |||||
| | CM2824 Series | Signal Line | 800.00 | 5800.00 | 0.70 | 0.26 | 6.00 | ||||
 | CM5022 Series | Power Line | 80.00 | 5.00 | 0.02 | 6.00 | |||||
 | CM3822 Series | Power Line | 80.00 | 5.00 | 0.02 | 6.00 | |||||
 | CMA0805 | 90.00 | 0.40 | 0.19 | 1.20 |