Common Mode Chokes20 µH · 0.7 A

CMC / 20 µH / 0.7 A

Compact common mode choke around 20 µH at 0.7 A for 250 V class adapter and small SMPS EMI stages.

Inductance: 20 µH class
Rated Current: 0.7 A
Rated Voltage: 250 V class
Mounting: THT

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2–3 week lead time
Prototype to bulk
Wound to your spec

Part outline

Core250 V class
MountingThrough-hole
OrientationHorizontal

Construction

Ferrite Core, Bifilar Copper Winding

Configuration · 20 µH · 0.7 A

How it works

Blocks the noise, passes the power

A series inductor in the supply line that somehow presents almost no impedance to the load current. The trick is winding direction — and it is easier to see than to describe.

Differential mode

Passes

FLUX CANCELS → low impedance

Load current flows out on one line and back on the other. The two fluxes are equal and opposite, so they cancel in the core — the choke is nearly invisible and your supply current is untouched.

Common mode

Blocks

FLUX ADDS → high impedance

Noise appears on both lines in the same direction at once. Now the fluxes add, the core presents its full impedance, and the noise is choked off before it reaches the mains.

Both windings share one core · current direction decides the outcome

Specification

Published figures describe the standard build. Every part is wound to order — send your exact requirement and we will confirm the specification on the quotation.

Inductance: 20 µH class
Rated Current: 0.7 A
Rated Voltage: 250 V class
Mounting: THT
Application: Adapter, SMPS EMI

Typical applications

Toroidal and UU-core common mode chokes for EMI/RFI suppression. Used to bring switching supplies, drives and chargers into conducted-emissions compliance.

EMC compliance
Chargers
Drives
Appliances
Lighting
Medical

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Need CMC / 20 µH / 0.7 A to a different specification?

Send your inductance, turns ratio, current rating and mechanical envelope — we will come back with a design and a price.

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