EMI Chokes

Ring Core Line filters for Power Lines and DC Link

Electrical and electronic equipment generates common-mode interference. To meet the safety requirements within the leakage current limits, chokes with a high asymmetrically effective inductance must be used. Common-mode chokes with a closed ring core are especially suitable for this purpose.

To suppress differential-mode interferences, chokes with iron powder ring cores are used. Double chokes with coupled windings bring advantages in EMI performance.

With manufacturing locations in Europe as well as in China and India, TDK is focusing on high-volume production for the global market.

TDK offers standard products as well as customized solutions and we continuously expand our product portfolio with new innovative solutions.

Features and Benefits

Features

High resonance frequency due to special winding technique
Robust in-molded terminals with Ni, Sn plating
Suitable for automated pick-&-place processing
Stick magazine packing options available on request

Versions

Variable pinning versions available
SMD versions available
Horizontal and vertical versions available
Established industrial standard outline packages

Approvals

UL and VDE/ENEC approvals for power line applications

Ring core chokes product line-up

Common-mode chokes for power lines (1)

Download data sheets	B82720A/K*	B82791G/H/K	B82791H2*N010
Target application	Line filters	Line filters	Line filters
Special features			Very high frequencies
Rated voltage [V AC]	250	250	250
Rated voltage [V DC]
Nominal inductance [mH]	1.1 … 22	4.7 … 47	14 … 100
Rated current [A]	0.3 ... 2	0.1	1.5 … 4
Rated temperature [°C]	+40	+40, 60, 70	+70
Lead spacing [mm]	10 x 7.5 / 10 x 10	10 x 15 / 12.7 x 5.08 / 2.54	12.7 x 5.08 / 2.54
Size l x w x h [mm]	14.2 x 14.2 x 9.6 / 13.3 x 9.5 x 14.3	17.5 x 17.5 x 8 / 15.3 x 7.4 x 17.6	15.3 x 7.4 x 17.6
Download step files	B82720A B82720K	B82791G2 B82791H2 B82791K	B82791H2*N010
Approvals	UL 1283 or UL 60939-3 and VDE/ENEC to IEC 60938-2 are mentioned in the respective datasheet.

Common-mode chokes for power lines (2)

Download data sheets	B82721A/J/K	B82721K2U	B82722A/J	B82723A/J
Target application	Line filters	Home appliances	Line filters	Line filters
Special features		IEC 60335, CTI>250, full potting		High inductance
Rated voltage [V AC]	250	250	250	250
Rated voltage [V DC]
Nominal inductance [mH]	0.2 … 47	0.4 … 47	1.2 … 68	0.45 … 56
Rated current [A]	0.3 … 6	0.4 … 2.8	0.3 … 3	0.5 … 8
Rated temperature [°C]	+40, 50, 60, 70	+70	+40, 60	+40, 60, 70
Lead spacing [mm]	10 x 5 / 10 x 15	10 x 15	10 x 12.5 / 20 x 12.5	15 x 12.5 / 25 x 15
Size l x w x h [mm]	17.9 x 17.3 x 12.6 / 18.2 x 13.2 x 20.3	18.2 x 13.2 x 20	22.7 x 22.3 x 13.3 / 23.3 x 16.1 x 25.4	28 x 27 x 16.8 / 28 x 15 x 30.5
Download step files	B82721A B82721J B82791K2	B82721K2U	B82722A B82722J	B82723A B82723J
Approvals	UL 1283 or UL 60939-3 and VDE/ENEC to IEC 60938-2 are mentioned in the respective datasheet.

Common-mode chokes for power lines (3)

Download data sheets	B82724A/J	B82724J2*U	B82724J8*N	B82724B
Target application	Line filters	Home appliances	DC link	Line filters
Special features	High voltage	IEC 60335, CTI > 250, full potting	Full potting
Rated voltage [V AC]	250	250	250	250
Rated voltage [V DC]			800
Nominal inductance [mH]	0.5 … 6.8	0.5 … 6.8	0.5 … 47	1.8 … 100
Rated current [A]	4.3 … 10	4.3 … 10	1.6 … 10	0.5 ... 6
Rated temperature [°C]	+70, 80	+70, 80	+70	+40, 50, 60
Lead spacing [mm]	15 x 12.5	15 x 12.5	15 x 12.5	30 x 20
Size l x w x h [mm]	31.3 x 18.5 x 33.2	31.3 x 18.5 x 33.2	31.3 x 18.5 x 33.2	33.6 x 32.6 x 25
Download step files	B82724A 82724J	B82724J2*U	B82724J8*N	B82724B
Approvals	UL 1283 or UL 60939-3 and VDE/ENEC to IEC 60938-2 are mentioned in the respective datasheet.

Common-mode chokes for power lines (4)

Download datasheets	B82725A	B82725J
Target application	Line filters	Line filters
Special features
Rated voltage [V AC]	250	250
Rated voltage [V DC]
Nominal inductance [mH]	0.56 … 82	1.8 … 68
Rated current [A]	1 … 16	1 … 10
Rated temperature [°C]	+40, 45, 55, 60	+60
Lead spacing [mm]	40 x 15	17.5 x 12.5
Size l x w x h [mm]	44 x 42.4 x 25	40.4 x 21.5 x 40
Download step files	B82725A	B82725J
Approvals	UL 1283 or UL 60939-3 and VDE/ENEC to IEC 60938-2 are mentioned in the respective datasheet.

Common-mode chokes ‒ SMD

Download datasheets	B82720S	B82720S0	B82721S0	B82722S0
Target application	Line filters	DC/DC low voltage	DC/DC low voltage	DC/DC low voltage
Special features	SMD	SMD	SMD	SMD
Rated voltage [V AC]	250	48	48	48
Rated voltage [V DC]		80	80	80
Nominal inductance [mH]	1.1 … 22	0.88	0.22 … 3	0.16 ... 5.6
Rated current [A]	0.3 … 2	1.8	0.7 … 5.6	3.25 … 19
Rated temp. [°C]	+40	+40	+40	+40
Lead spacing [mm]
Size l x w x h [mm]	17 x 13.3 x 10.8	12.7 x 12.7 x 5.46	19.3 x 17.02 x 10.1	30.99 x 25.4 x 12.7
Download step files	B82720S	B82720S0	B82721S0	B82722S0
Approvals	UL 1283 or UL 60939-3 and VDE/ENEC to IEC 60938-2 are mentioned in the respective datasheet.

Differential-mode chokes

Download data sheets	B82615	B82623	B82625
Target applications	Line filters	Line filters	Line filters
Special features		Double choke / coupled inductor	Double choke / coupled inductor
Rated voltage [V AC]	250	250	250
Rated voltage [V DC]	350	350	350
Nominal inductance [mH]	0.7 ... 20	0.033 ... 1.2	0.25 ... 5.0
Rated current [A]	1 ... 6	0.3 ... 3	1 ... 5
Rated temperature [°C]	+40	+60	+40
Lead spacing [mm]	15 x 40	15 x 25	15 x 40
Size l x w x h [mm]	44 x 42.4 x 30	28 x 27 x 16.8	44 x 42.4 x 30
Download step files	B82615	B82623	B82625
Approvals	UL 1283 or UL 60939-3 and VDE/ENEC to IEC 60938-2 are mentioned in the respective datasheet.

Main applications

Can be used for

Service robots

EV fast charger

Medical & Healthcare

ICT – 5G

E-Bike & Pedelec

Photovoltaic

Industrial robot

Home appliance

Drives

Automotive

Design	Inductance (mH)	Rated current (A)	Rated temperature (°C)	Rated voltage (V AC)	Rated voltage (V DC)	Number of lines	Type
Current-compensated ring core choke	1.1 - 22	0.3 - 2	40	250	---	Double	B82720S
Current-compensated ring core choke	1.2 - 68	0.3 - 3	40, 60	250	---	Double	B82722A, B82722J
Current-compensated ring core choke	0.2 - 47	0.3 - 6	40, 50, 60, 70	250	---	Double	B82721A, B82721J, B82721K
Current-compensated ring core choke	1.1 - 22	0.3 - 2	40	250	---	Double	B82720A, B82720K
Current-compensated ring core choke	0.56 - 82	1 - 16	40, 45, 55, 60	250	---	Double	B82725A
Current-compensated ring core choke	1 - 82	0.5 - 6	40, 45, 50, 60, 70	250	---	Double	B82724A, B82724J
Current-compensated ring core choke	0.45 - 56	0.5 - 8	40, 60, 70	250	---	Double	B82723A, B82723J
Current-compensated ring core choke	1.8 - 100	0.5 - 6	40, 50, 60	250	---	Double	B82724B
Current-compensated ring core choke	1.8 - 68	1 - 10	60	250	---	Double	B82725J
Current-compensated ring core choke	0.5 - 6.8	4.3 - 10	70, 80	250	---	Double	B82724J2*U
Current-compensated ring core choke	4.7 - 47	0.25 - 1	40, 60, 70	250	---	Double	B82791G, B82791H, B82791K
Current-compensated ring core choke	14 - 100	1.5 - 4	70	250	---	Double	B82791H2*N010
Current-compensated ring core choke (double)	0.4 - 47	0.4 - 2.8	70	250	---	Double	B82721K2U
Current-compensated ring core choke (double)	0.5 - 47	1.6 - 10	70	250	800	Double	B82724J8*N
Ring core choke with powder core (double)	0.25 - 5	1 - 5	40	250	350	Double	B82625B
Ring core choke with powder core (double)	0.033 - 1.2	0.3 - 3	60	250	350	Double	B82623G
Ring core choke with powder core (single)	0.7 - 20	1 - 6	40	250	350	Single	B82615B
---	0.16 - 5.6	3.25 - 19	40.0	48	80	Double Choke	B82722S0
---	0.22 - 3	2.7 - 5.7	40.0	48	80	Double Choke	B82721S0

In order to download up to 20 files together as zip, please mark them with the check box. To start the download, please click the Download button at the end of the list.

Number of Products 278 Help

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Frequently asked questions

What are the benefits of using a ring core choke?

A common mode choke in the EMI filtering circuit helps to achieve electromagnetic compatibility (EMC) by suppressing conducted common-mode noise in all types of power transmission and power lines. The closed ring core structure achieves the maximum in suppression of common-mode interferences and provides the best geometry for magnetic flux.

Do EMI chokes generate heat?

They do generate heat which is proportional to the power loss. The amount of power is calculated using the standard I²×R_dc equation, where R_dc is the total DC-resistance of the choke, and I is the applied DC current or the RMS value of AC current. EMI chokes are designed and intended to suppress high-frequency noise and there is usually no significant loss generated by this in the core or windings that might contribute additionally to the heating.

Whats about polarity?

The mounting direction does not impact the operating characteristics of common mode chokes.

What is the difference between a ring core choke and D core choke?

Typically, D-core chokes achieve higher pulse withstanding capability while ring core topology generates much less stray magnetic fields.

What is meant by “special winding technique”?

The main difference to standard coils is that many of our ring core chokes feature a special winding structure, allowing higher resonance frequencies to be reached even with very high number of turns.

What is the difference between a common- mode choke and differential-mode choke?

Common-mode chokes suppress noise flowing in the same direction in all lines, differential-mode chokes work with signals or noise flowing in opposite directions in a pair of lines.

Is it possible to apply higher current than rated, even for a short period time?

Even though it depends on the magnitude and time of the applied current, the warranty of our products doesn’t cover the usage with a higher current than rated at the specific ambient temperature. Currents deviating from rated values can only be applied in accordance with the corresponding derating curves given in the data sheets.

Why is there no marking for the winding direction on the EMI chokes?

The mounting/assembly direction of the common mode these chokes does not impact the operating characteristics of it.

Product resources

Publications

Product Brief

Power Line Chokes

Presentation of common-mode chokes, current-compensated chokes and line filters

NiZn Ring Core Chokes: Series B82791H2*N010

L_N from 14 μH to 100 μH
I_R from 1.5 A to 4 A / +70 °C
Rated voltage 250 V AC (50/60 Hz)

Order from distributor

Ordering No.: B82791X1

Order from Mouser Order from Digi-Key

Ring Core Chokes for Power Lines: Series B82723

L_R from 1.0 mH to 39,0 mH
I_R from 1.0 A to 6.0 A
Rated voltage 250 V AC (50/60 Hz)

Order from distributor

Ordering No.: B82723X1

Order from Mouser Order from Digi-Key

Ring Core Chokes for Power Lines: Series B82722

L_Rfrom 1.2 mH to 39.0 mH
I_R from 0.5 A to 3.0 A
Rated voltage 250 V AC (50/60 Hz)

Order from distributor

Ordering No.: B82722X1

Order from Digi-Key Order from Mouser

Ring Core Chokes for Power Lines: Series B82721

L_R from 0.7 mH to 39.0 mH
I_R from 0.4 A to 4.0 A
Rated voltage 250 V AC (50/60 Hz)

Order from distributor

Ordering No.: B82721X1

Order from Digi-Key Order from Mouser

Model libraries

The libraries include models of the complete SIMID series of current product range (EIA sizes 0603 to 2220). The models of the various series are delivered in individual libraries for each series (0603, 0805, 1210, 1812 etc.). Individual libraries for current SMT power inductors are available for download sorted by size (6x6, 10x10 etc.).

From Digikey

From Mouser

Via Sales Network

Model libraries

Models of the complete SIMID series for the simulation programs PSPICE, HSPICE, LTspice and ANSYS.

Customized S-parameters

Do you need something special?
Please use our inquiry form to specify your requirements for customer-specific S-parameters.

Material data sheets

Typical compositions of product groups by selected representatives. Materials are listed with their percentage weight distribution per component.

D-Core Chokes

High-Current Ring Core Chokes

Industrial Automation

Sales Network & Sites

If you are interested in our products, you will find here an overview of our worldwide sales offices, which you can contact quickly and easily

Product Inquiry

Are you interested in our solutions? Please do not hesitate to contact us! We will be glad to help you.

Tradeshows & Events

Experience TDK live!

EMI Chokes

Ring Core Line filters for Power Lines and DC Link

Features and Benefits

Ring core chokes product line-up

Common-mode chokes for power lines (1)

Common-mode chokes for power lines (2)

Common-mode chokes for power lines (3)

Common-mode chokes for power lines (4)

Common-mode chokes ‒ SMD

Differential-mode chokes

Main applications

Can be used for

Service robots

EV fast charger

Medical & Healthcare

ICT – 5G

E-Bike & Pedelec

Photovoltaic

Industrial robot

Home appliance

Drives

Automotive

Get data sheets and search

Frequently asked questions

What are the benefits of using a ring core choke?

What are the benefits of using a ring core choke?

Do EMI chokes generate heat?

Do EMI chokes generate heat?

Whats about polarity?

Whats about polarity?

What is the difference between a ring core choke and D core choke?

What is the difference between a ring core choke and D core choke?

What is meant by “special winding technique”?

What is meant by “special winding technique”?

What is the difference between a common- mode choke and differential-mode choke?

What is the difference between a common- mode choke and differential-mode choke?

Is it possible to apply higher current than rated, even for a short period time?

Is it possible to apply higher current than rated, even for a short period time?

Why is there no marking for the winding direction on the EMI chokes?

Why is there no marking for the winding direction on the EMI chokes?

Product resources

Publications

Product Brief

Power Line Chokes

Sample kits

NiZn Ring Core Chokes: Series B82791H2*N010

Order from distributor

Ring Core Chokes for Power Lines: Series B82723

Order from distributor

Ring Core Chokes for Power Lines: Series B82722

Order from distributor

Ring Core Chokes for Power Lines: Series B82721

Order from distributor

Model libraries

Order now

From Digikey

From Mouser

Via Sales Network

Design support

Model libraries

Customized S-parameters

Material data sheets

Explore more

D-Core Chokes

High-Current Ring Core Chokes

Industrial Automation

Get in contact

Sales Network & Sites

Product Inquiry

Tradeshows & Events

Social Media

Product Notice

Resources for Inductors

Environmental Information

General information