B82721A2501N021

Overview

The B82721A2501N021 is a current-compensated ring core double choke manufactured by EPCOS (TDK). It features a ferrite core and polycarbonate case with polyurethane potting. The component has a rated inductance of 18 mH at 10 kHz, a maximum DC current rating of 500 mA, and a typical maximum DC resistance of 1.4 Ohms. It operates within a temperature range of -40 °C to +125 °C and utilizes radial termination.

Feature Summary

• Current-compensated design for symmetrical interference suppression
• High resonance frequency due to special sector winding technique
• Flame-retardant construction compliant with UL 94 V-0 standards

Applications

• Power line filtering in electronic equipment
• Common mode noise suppression in AC power inputs
• EMI reduction in industrial control systems

Procurement Notes

Verify the specific suffix N021 against the official EPCOS TDK datasheet to confirm terminal configuration and packaging details. Ensure the selected variant matches the required inductance tolerance and current rating for the target circuit application before procurement.

Selection Notes

Select this component for applications requiring high common mode impedance with low differential mode inductance. The 18 mH value suits moderate frequency noise suppression. Verify that the 500 mA current rating exceeds the peak load current to prevent saturation and ensure thermal stability within the specified operating temperature range.

Part Context

This part belongs to the B82721 series of power line chokes designed for AC mains filtering. The series offers various inductance values and current ratings using current-compensated ring core technology. These components are widely used in consumer and industrial electronics to meet electromagnetic compatibility requirements.

Replacement Considerations

Check equivalent parts from the B82721 family with matching 18 mH inductance and 500 mA rating. Verify physical dimensions and pinout compatibility for direct replacement without PCB redesign.