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© Coilcraft Inc. 2013

This product may not be used in medical or high

risk applications without prior Coilcraft approval.

Specification subject to change without notice.

Please check web site for latest information.

Common Mode Line Chokes–EE Styles

Document 141-1

Document 141-1 Revised 04/20/12

• Low cost

• 3 mm creepage and clearance from all terminations to the

core

• 3750 Vrms, one minute isolation between windings

• UL1446 Class B (130°C) Insulation System (UL File E83628)

• Industry-standard EE25 size

• Wide range of available inductances and current ratings

Coilcraft

Designer’s Kit No. P402 contains samples

of eight standard EE and toroidal common mode line

chokes. To order, contact Coilcraft or purchase on-line at

buy.coilcraft.com.

Coilcraft common mode standard packages incorporate

several features to help meet the requirements of major

safety agencies.These include 2 mm thick center flanges

and 3 mm creepage and clearance from all terminations

to the core.

Common mode chokes are used to reduce AC line con-

ducted interference produced by switching power supplies.

This configuration produces opposing magnetic fluxes in

the core that serve to cancel in-phase noise signals ap-

pearing across the AC line.

This mode allows much more filtering capability in a given

core size than would be possible using differential filtering

alone. Use of common mode chokes therefore reduces

component count as well as inductor size.

Combining both common and differential mode chokes

gives the power supply designer the added flexibility

required to adjust the filtering to meet FCC, VDE, and

other requirements as well as optimize the circuit for the

particular noise levels and frequencies produced by each

power supply design.

The Coilcraft packaging of common mode chokes allows

windings to be balanced within 1% and features the cost

effectiveness of standard EE core styles.

Schematic

Typical Application

AC

input

2

2

9

9

4

4

7

7

0.1 µF

0.1 µF

0.005 µF

0.005 µF