B82721K2122N020

Overview

The B82721K2122N020 is a current-compensated ring core double choke manufactured by EPCOS (TDK Electronics). It features a ferrite core and is housed in a polycarbonate case with polyurethane potting. The component has an inductance of 6800 µH (6.8 mH) with a tolerance of ±30%. It supports a maximum DC current of 1.2 A and exhibits a typical DC resistance of 280 mΩ. Designed for through-hole mounting, it operates within a temperature range of -40 °C to +125 °C and meets UL 94 V-0 flame retardancy standards.

Feature Summary

• Current-compensated design utilizing sector winding on a ferrite ring core to minimize stray inductance.
• High resonance frequency achieved through specialized winding techniques for effective interference suppression.
• Robust construction featuring a polycarbonate case and polyurethane potting compliant with UL 94 V-0 standards.

Applications

• Power line filtering in electronic equipment
• Common mode noise suppression in dual-line circuits
• General purpose electromagnetic interference mitigation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest datasheet to ensure compatibility with required voltage ratings and mechanical dimensions. Confirm that the RoHS compliance status matches project requirements. Cross-reference the part number with official TDK/EPCOS documentation to validate the inductance value and current rating specifications before finalizing procurement orders.

Selection Notes

Select this component when a high-inductance common mode choke is required for power line applications. The 1.2 A current rating and 6800 µH inductance make it suitable for suppressing low-frequency noise. Ensure the PCB layout accommodates the through-hole package dimensions and that the operating environment stays within the specified -40 °C to +125 °C temperature range.

Part Context

This component belongs to the B82721 series of current-compensated ring core double chokes. The series is designed for power line applications where symmetrical interference suppression is critical. The specific model utilizes a ferrite core and offers high stability due to its potting and winding construction, distinguishing it from standard air-core or single-winding inductors.

Replacement Considerations

Consult official substitution lists for equivalent models within the B82721 series. Verify that any alternative part maintains identical inductance, current rating, and mechanical footprint to ensure circuit compatibility without redesign.

FAQ

What is the stray inductance characteristic of this choke?

The component is designed with approximately 1% stray inductance to ensure symmetrical interference suppression.

How is the coil winding structured?

It uses a sector winding technique on a ferrite ring core to achieve high resonance frequency and low stray inductance.