---- April 21st 2024 ----

CAGE Code: 5DME2
ITAR Registration Code: M28889
Call: 1 (800) 377-3244
Monday to Friday 8 A.M. - 5 P.M. (Pacific Time)
E-mail questions and requirements to: sales@coilws.com

Pricing is subject to change depending on product availability and backorders.
*Please Note: Items without price are listed for CWS' capability purposes.

Differential & Common combination

Combination Differential Common Mode Choke and Inductor

Used as common mode choke but the circuit also has a DC bias or imbalanced AC power.

Differential-mode choke is used to filter electrical noise signal that appears on each of two lines (high and low line) of a closed loop, with current flowing in opposite directions. Sometimes a differential mode inductor is used one on each the high line and another one on the the low line. In such as case, 2 differential mode inductors are used in each circuit loop. The differential mode noise interference appears in series with the desired electrical signal. These electrical noise can be reduced by using an inductor in series with the high side and/or low side (ground) of the power line and by using a shunt capacitor across the 2 lines.

On the other hand, a common-mode EMI noise signal appears on the high and the low signal lines simultaneously in the same direction and phase. The common mode noise signal on each high line and low line returns through a common ground. A common-mode choke has 2 sets of windings on the same core with opposite polarity. When connected to the high line and low line on the same cores with opposite polarity, equal and opposite magnetic fields are generated on the core that cancels out the flux produced by the current flowing through the core, except the common mode noise that are filtered out by the inductor. A capacitor from each line to ground is also used.

In some application, there are both common mode noise and differential mode noise on the high and low lines such as a power line with DC bias or imbalanced AC currents on each lines. In such an application, the combination common mode differential mode choke is a good choice to use. However, because the cores cannot go into saturation due to the differential mode current (DC bias current), a lower permeability iron powder cores are used, and as such the common mode filtering is much lower than a ferrite based common mode choke with the same number of turns.

These 2-phase combination common mode/ differential chokes are wound on a distributed gap compacted powder cores with lower permeability than the regular high permeability Ferrite or Nanocrystalline and Amorphous ribbon based cores. By winding 2 windings on distributed gap iron powder cores, each winding acts as a differential mode chokes as well.

Part Number Inductance Current
Rating (Amps)
DCR (milli-Ohms) Dimension (OD/ID/HT) mm SRF Impedance @ SRF 3D Model Quantity
on hand
MCI467-331M-40AH 330uH 40 Amps 16 74.0 x 5.6 x 67.0 3.3 Mhz 16 kΩ 3D STEP 0
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MCI467-300M-40AH 30uH 40 Amps 5 59.0 x 7.8 x 35.0 8.23 Mhz 4 kΩ 3D STEP 0
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CWS-1MF-12960 REV.B1 3uH 125 Amps 0.55 76.2 x 19.05 x 76.2 100 Mhz 160 Ω   0 $200.00
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Disclaimer: Coil Winding Specialist, Inc., its affiliates, agents, and employees acting on behalf of Coil Winding Specialist, Inc. (collectively, CWS) disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. CWS reserves the right at any time and from time to time to make changes to design, technical specification, or construction of any product listed on this website without notice. CWS also reserves the right to discontinue or limit sale of any product or service available throughout this website on temporary or permanently basis without notice. CWS highly recommends customers not to use its products offered on this website for inappropriate use and applications. Products should be tested for its suitability by prospective customers in all possible applications and conditions. Customers using or selling CWS products for use in other than recommended applications do so entirely at their own risk and agree to fully indemnify CWS from any damages arising or resulting from such use or sale.

WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go towww.P65Warnings.ca.gov.

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Email: sales@coilws.com
CWS 353 West Grove Ave. Orange, California 92865
Call us Toll Free: 1-800-679-3184 or 1 (800) 377-3244

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Copyright 2008, Coil Winding Specialist, Inc
Updated July, 2013

CAGE Code: 5DME2(Registered with www.ccr.gov)