TDK-B82731T2351A020

Power line chokes  

Current-compensated E core double chokes  

250 V AC, 0.3 … 1.8 A, 3.3 … 100 mH, +40 °C  

Series/Type:  

B82731T  

Date:  

a~í~=pÜÉÉí

July 2012  

© EPCOS AG 201

5

. Reproduction, publication and dissemination of this publication, enclosures hereto and the  

information contained therein without EPCOS’ prior express consent is prohibited.  

EPCOS AG is a TDK Group Company.  

Power line chokes  

B82731T  

Current-compensated E core double chokes  

Rated voltage 250 V AC  

Rated current 0.3 … 1.8 A  

Rated inductance 3.3 … 100 mH  

Construction  

■

Current-compensated double choke  

■

Closed E ferrite core  

■

Closed PET coil former with 4 sections (UL 94 V-0)  

■

Without encapsulation  

■

4-section winding  

■

Clearances



2.5 mm, creepage distances



3 mm  

Features  

■

High resonance frequency due to 2-section winding  

■

High pulse strength  

■

Low whirring noise  

■

Approx. 2% stray inductance for symmetrical  

interference suppression  

■

Suitable for wave soldering  

■

Design complies with EN 60938-2 (VDE 0565-2) and UL 1283  

■

UL and ENEC (VDE) approvals  

■

RoHS-compatible  

Applications  

■

Suppression of common-mode interferences  

■

Electronic ballasts for lamps  

■

Switch-mode power supplies for consumer electronics  

Terminals  

■

Pins 0.64



0.64 (mm)  

■

Lead spacing 10



10 (mm)  

Marking  

Manufacturer, rated current, rated inductance,  

approvals, pin 1 marking, ordering code,  

date of manufacture (YYWW), production place  

Delivery mode  

Blister tray in cardboard box  

Please read

Cautions and warnings

and  

Important notes

at the end of this document.  

2

07/12  

Power line chokes  

B82731T  

Current-compensated E core double chokes  

Dimensional drawing and pin configuration  

1

6

3

4

1

6

3

4

10±0.2  

IND0360-U  

21.5 max.  

ø1.45±0.05  

6

4

3

0.64  

1

10  

Recommended hole arrangement  

(view in mounting direction)  

Marking of pin 1  

IND0359-Z-E  

IND0361-L-E  

Tolerances to ISO 2768-C unless otherwise noted.  

Dimensions in mm  

Please read

Cautions and warnings

and  

Important notes

at the end of this document.  

3

07/12  

Power line chokes  

B82731T  

Current-compensated E core double chokes  

Technical data and measuring conditions  

Rated voltage V

R  

Test voltage V

test  

Rated temperature T

R  

Rated current I

R  

250 V AC (50/60 Hz)  

1500 V AC, 2 s (line/line)  

+40



C  

Referred to 50 Hz and rated temperature  

Rated inductance L

R  

Measured with Agilent 4284A at 10 kHz, 0.1 mA, +20 °C  

Inductance is specified per winding.  

Inductance tolerance  



30/+50% at +20 °C  

Inductance decrease



L/L

0  

Stray inductance L

stray,typ  

< 10% at DC magnetic bias with I

R

, +20 °C  

Measured with Agilent 4284A at 10 kHz, 5 mA, +20 °C,  

typical values  

DC resistance R

typ  

Measured at +20 °C, typical values, specified per win-  

ding  

Solderability (lead-free)  

Sn96.5Ag3.0Cu0.5: +(245



5) °C, (3



0.3) s  

Wetting of soldering area



95%  

(to IEC 60068-2-20, test Ta)  

Resistance to soldering heat  

(wave soldering)  

+(260



5) °C, (10



1) s  

(to IEC 60068-2-20, test Tb)  

Climatic category  

Storage conditions (packaged)  

Weight  

40/125/56 (to IEC 60068-1)  

–25 °C … +40 °C,



75% RH  

Approx. 15 g  

Approvals  

EN 60938-2, UL 1283  

Please read

Cautions and warnings

and  

Important notes

at the end of this document.  

4

07/12  

Power line chokes  

B82731T  

Current-compensated E core double chokes  

Characteristics and ordering codes  

I

R  

L

R  

mH  

100  

68  

L

stray,typ  



H  

R

typ  

m

  

Ordering code  

Approvals  

A

0.30  

0.35  

0.45  

0.55  

0.65  

0.8  

1.0  

1.3  

1.8  

2000  

1300  

950  

6600  

4400  

2800  

2200  

1600  

950  

B82731T2301A020  

B82731T2351A020  

B82731T2451A020  

B82731T2551A020  

B82731T2651A020  

B82731T2801A020  

B82731T2102A020  

B82731T2132A020  

B82731T2182A020  





































47  

39  

800  

27  

550  

15  

300  

10  

200  

630  

6.8  

3.3  

140  

370  

65  

200  



= approval granted  

Sample kit available. Ordering code: B82731X002  

For more information refer to chapter “Sample kits”.  

Impedance |Z| versus frequency f  

measured with windings in parallel at +20 °C  

typical values  

Current derating I

op

/I

R  

versus ambient

 

temperature T

A  

IND0363-B  

1

0

7  

B82731  

Ω

|

Z

|  

1

0

6  

1

0

5  

1

0

4  

1

0

3  

1

0

2  

T2551A020  

T2451A020  

T2351A020  

T2301A020  

T2182A020  

T2132A020  

T2102A020  

T2801A020  

T2651A020  

1

0

4  

1

0

5  

1

0

6  

Hz 1

0

7  

f

Please read

Cautions and warnings

and  

Important notes

at the end of this document.  

5

07/12  

Cautions and warnings  

Current-compensated ring core double chokes  

■

Please note the recommendations in our Inductors data book (latest edition) and in the data  

sheets.  

– Particular

 

attention should be paid to the derating curves given there. Derating must be applied  

in case the ambient temperature in the application exceeds the rated temperature of the  

component.  

– Ensure the operation temperature (which is the sum of the ambient temperature and the  

temperature rise caused by losses / self-heating) of the component in the application does not  

exceed the maximum value specified in the climatic category.  

– The soldering conditions should also be observed. Temperatures quoted in relation to wave  

soldering refer to the pin, not the housing.  

■

If the components are to be washed varnished it is necessary to check whether the washing  

varnish agent that is used has a negative effect on the wire insulation, any plastics that are used,  

or on glued joints. In particular, it is possible for washing varnish agent residues to have a  

negative effect in the long-term on wire insulation.  

Washing processes may damage the product due to the possible static or cyclic mechanical  

loads (e.g. ultrasonic cleaning). They may cause cracks to develop on the product and its parts,  

which might lead to reduced reliability or lifetime.  

■

The following points must be observed if the components are potted in customer applications:  

– Many potting materials shrink as they harden. They therefore exert a pressure on the plastic  

housing or core. This pressure can have a deleterious effect on electrical properties, and in  

extreme cases can damage the core or plastic housing mechanically.  

– It is necessary to check whether the potting material used attacks or destroys the wire  

insulation, plastics or glue.  

– The

 

effect of the potting material can change the high-frequency behaviour of the components.  

■

Ferrites are sensitive to direct impact. This can cause the core material to flake, or lead to  

breakage of the core.  

■

Even for customer-specific products, conclusive validation of the component in the circuit can  

only be carried out by the customer.  

Please read

Cautions and warnings

and  

Important notes

at the end of this document.  

6

07/12  

Important notes  

The following applies to all products named in this publication:  

1.

Some parts of this publication contain

statements about the suitability of our products for certain  

areas of application

. These statements are based on our knowledge of typical requirements that are  

often placed on our products in the areas of application concerned. We nevertheless expressly point  

out

that such statements cannot be regarded as binding statements about the suitability of our  

products for a particular customer application.

As a rule we are either unfamiliar with individual  

customer applications or less familiar with them than the customers themselves. For these reasons, it is  

always ultimately incumbent on the customer to check and decide whether a product with the properties  

described in the product specification is suitable for use in a particular customer application.  

2.

We also point out that

in individual cases, a malfunction of electronic components or failure  

before the end of their usual service life cannot be completely ruled out in the current state of the  

art, even if they are operated as specified.

In customer applications requiring a very high level of  

operational safety and especially in customer applications in which the malfunction or failure of an  

electronic component could endanger human life or health (e.g. in accident prevention or life-saving  

systems), it must therefore be ensured by means of suitable design of the customer application or other  

action taken by the customer (e.g. installation of protective circuitry or redundancy) that no injury or  

damage is sustained by third parties in the event of malfunction or failure of an electronic component.  

3.

The warnings, cautions and product-specific notes must b

e

observed.  

4.

In order to satisfy certain technical requirements,

some of the products described in this publication  

may contain substances subject to restrictions in certain jurisdictions (e.g. because they are  

classed as hazardous)

. Useful information on this will be found in our Material Data Sheets on the  

contact our sales offices.  

5.

We constantly strive to improve our products. Consequently,

the products described in this  

publication may change from time to time

. The same is true of the corresponding product  

specifications. Please check therefore to what extent product descriptions and specifications contained  

in this publication are still applicable before or when you place an order.  

We also

reserve the right to discontinue production and delivery of products

. Consequently, we  

cannot guarantee that all products named in this publication will

 

always be available.

 

The  

aforementioned does not apply in the case of individual agreements deviating from the foregoing for  

customer-specific products.  

6.

Unless otherwise agreed in individual contracts,

all orders are subject to our General Terms and  

Conditions of Supply.  

7.

Our manufacturing sites serving the automotive business apply the IATF 16949 standard.

The  

IATF certifications confirm our compliance with requirements regarding the quality management system  

in the automotive industry. Referring to customer requirements and customer specific requirements  

(“CSR”) TDK always has and will continue to have the policy of respecting individual agreements. Even  

if IATF 16949 may appear to support the acceptance of unilateral requirements, we hereby like to  

emphasize that

only requirements mutually agreed upon can and will be implemented in our  

Quality Management System.

For clarification purposes we like to point out that obligations from IATF  

16949 shall only become legally binding if individually agreed upon.  

8.

The trade names EPCOS, CeraCharge, CeraDiode, CeraLink, CeraPad, CeraPlas, CSMP, CTVS,  

DeltaCap, DigiSiMic, ExoCore, FilterCap, FormFit, LeaXield, MiniBlue, MiniCell, MKD, MKK, MotorCap,  

PCC, PhaseCap, PhaseCube, PhaseMod, PhiCap, PowerHap, PQSine, PQvar, SIFERRIT, SIFI,  

SIKOREL, SilverCap, SIMDAD, SiMic, SIMID, SineFormer, SIOV, ThermoFuse, WindCap are  

trademarks registered or pending

in Europe and in other countries. Further information will be found  

Release 2018-10  

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