TDK B82722V6 Choke Supports 1250 V DC Designs

Uploaded image TDK has introduced a new high-voltage common-mode choke series for converter and drive designs that are pushing into higher DC bus voltages without giving up too much board space. The B82722V6B040 family is built for DC link voltages up to 1250 V and comes in a compact vertical format, which makes it easier to place in power converters, industrial motor drives, and switch-mode power supplies where insulation coordination and EMI control are both getting harder to ignore.

The B82722V6B040 is a current-compensated ring-core double choke used to suppress common-mode interference in high-voltage power electronics. In a converter or motor drive, it sits in the EMI filtering path where it helps keep conducted noise under control while the rest of the power stage deals with faster switching edges and higher bus voltages. That's a more demanding job now that SiC and GaN devices are showing up in more designs and pushing switching behavior well beyond what older filter choices were built around.

A Compact Choke For Higher DC Bus Architectures

One of the main points here is size. TDK is packaging the series in a 23 x 15.5 x 24 mm body, which is small for a component intended for 1250 V DC architectures. That matters because high-voltage filtering is rarely the only thing fighting for space. Once insulation distances, power semiconductors, thermal hardware, and connectors all start taking their share of the board, the passive filter section can become awkward very quickly.

The vertical design helps a bit with that. It gives engineers another way to fit a common-mode choke into a dense layout without stretching the footprint wider across the board. TDK also says the series is suitable for wave soldering, so this is clearly being positioned as a practical production part, not a niche filter option that becomes difficult to handle once the design moves toward manufacturing.

Inductance And Current Options Across The Family

The family covers nominal inductance values from 3.3 mH to 22 mH, with rated currents from 0.85 A to 3.0 A at an ambient temperature of 70 C. That gives it enough spread to cover a range of filtering needs across smaller converters and drive stages without forcing every design into the same compromise between current handling and noise suppression.

TDK lists six ordering codes in the series. At the high-inductance end, the B82722V6851B040 is rated at 22 mH and 0.85 A. At the other end, the B82722V6302B040 comes in at 3.3 mH and 3.0 A. The middle of the range steps through 15 mH, 10 mH, 6.8 mH, and 4.7 mH versions, so the lineup looks broad enough for engineers who need to tune around both EMI behavior and current demand instead of just taking one fixed value.

Winding And Insulation Details Matter Here

TDK is also putting some emphasis on how the part is built. The series uses multilayer solid insulation and is tested at 3750 V line-to-line, which is one of the more important details in a choke intended for elevated DC bus voltages. High-voltage filtering parts do not get much room for ambiguity once safety spacing and isolation expectations start tightening.

The company also points to a special automated winding technique that supports high resonance frequency characteristics, along with a typical stray inductance of around 0.6 percent. That low stray inductance is relevant because it helps suppress symmetrical interference, which can become more noticeable in faster-switching power stages where the filter has less margin for sloppy behavior.

Safety Standards Fit The Intended Use

The ferrite core uses an epoxy coating and the plastic header meets UL 94 V-0. TDK says the design complies with IEC 60938-2 and IEC/UL 60939-3 safety requirements for EMI chokes and filters. Those are the details engineers expect to see in a part like this, but they still matter because they help define where the series can be used with less friction during safety and compliance work.

Taken together, the B82722V6B040 family looks like a practical high-voltage EMI component for designers working on compact converters, motor drives, and switch-mode supplies where 1250 V DC operation is now part of the design envelope and the filter section still needs to stay under control.

Learn more and read the original announcement at www.tdk.com

Technology Overview

The B82722V6B040 family is a series of current-compensated ring-core double chokes for common-mode EMI suppression in high-voltage power electronics. The series is rated for up to 1250 V DC and 630 V AC and is available in inductance values from 3.3 mH to 22 mH with rated currents from 0.85 A to 3.0 A.

Frequently Asked Questions

What is the B82722V6B040 used for?

It is used for suppressing common-mode interference in power converters, industrial motor drives, and switch-mode power supplies.

What voltage rating does the TDK B82722V6B040 support?

TDK rates the series for up to 1250 V DC and 630 V AC.

What size is the B82722V6B040 choke?

The series has a compact vertical design measuring 23 x 15.5 x 24 mm.