TDK Electronics · TDK Europe

D-Core Chokes

EMC for Power Lines

TDK CeraLink capacitors

With the purpose to reach the EMC requirements within legal limits, TDK presents a closed-core topology with a plastic bobbin divided into chambers, resulting in higher resonance frequency and impedance performance.

Features and Benefits

  • Three different sizes for each vertical and horizontal version
  • Rated voltage 250 V AC
  • Rated currents at +40°C rated temperature
  • High self-resonance frequency due to 2-section winding
  • High nominal inductance values due to close core shape
  • High saturation and high impedance
  • Recyclable owing to omission of encapsulation and glue
  • UL, VDE approvals
  • RoHS compatible

Product Line-Up







Rated voltage




Nominal inductance

3.3 ... 100

3.3 ... 100

3.3 ... 68

Rated current

0.35 ...1.8

0.4 ... 2.2

0.7 ... 4.6

Rated temp.




Lead spacing

10 x 12.5

10 x 12.5

15 x 12.5

[mm] (l x w x h)

21 x 15.5 x 20
21 x 20 x 15

24 x 23.5 x 16.5
24 x 17.3 x 23.1

32.5 x 31 x 21
32.5 x 21.7 x 31

Overview of Available Types

Current range (A)
Inductance range (mH)

Main Applications

D-core chokes are ideal to comply with the strictest EMC requirements for switch mode power supply applications. In filtering circuits, their usage will contribute to the stability of the device’s working condition. This performance can be reached by higher inductance values than comparable components on a U-core basis.

Suitable for

 Solar Grid

Get data sheets and search

PDF Design Inductance (mH) Rated current (A) Rated temperature (°C) Rated voltage (V AC) Rated voltage (V DC) Number of lines Type
Current-compensated D core choke 3.3 - 100 0.4 - 2.2 40 250 --- Double B82732R, B82732W
Current-compensated D core choke 3.3 - 68 0.7 - 4.6 40,  60 250 --- Double B82734R, B82734W
Current-compensated D core choke 3.3 - 100 0.35 - 1.8 40 250 --- Double B82731H, B82731M

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.

  • General technical information
  • EMC services
  • Quality and environment
  • Cautions and warnings
  • Symbols and terms
  • I core chokes: General
  • Ring core chokes with iron powder core: General
  • Sine-wave chokes: General
  • Current-compensated chokes: General

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.


Frequently Asked Questions

What are common mode chokes used for?

A common mode choke in the EMI filtering circuit, helps to achieve electromagnetic compatibility (EMC), suppressing the conducted noise in all types of power transmission and power lines.

Why is there typically no marking for the winding direction (polarity) marked on common mode chokes? Is the assembly direction and alignment important for the operation?

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

Do common mode chokes produce heat?

Yes, they are emitting heat under operation. The generated power is calculated by the standard power equation: I² x R. R is the DC resistance and I the applied DC current, respectively the translated RMS value for an AC current. CM chokes are designed to suppress high-frequency noise, therefore, no significant HF losses are introduced into the core or winding, which contributes to the heat generation.

What is the difference between common-mode and differential-mode chokes?

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.

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

The main difference is that D-core chokes use a bobbin with separated winding chambers (2-sections per winding), allowing higher resonance frequencies to be reached. Typically, these chokes achieve higher pulse durability in addition.

 5 FAQ pic

Is it possible to apply more than its specified rated current, even for a short period of time?

Even though it depends on the magnitude and time period in which the current is applied, the warranty of our products doesn´t cover the usage with a higher rated current at the specific ambient temperature.

What is the meaning of Rated Temperature and how is it specified?

The rated temperature (TR) is defined by industrial standards as the maximum ambient temperature at which an inductor can carry its rated current (IR). If the ambient temperature in the application is higher than the rated temperature, derating should be considered to ensure safe operation.

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