B82721J2401N021

Overview

The B82721J2401N021 is a current-compensated ring core double choke from the EPCOS B82721 series, designed for power line applications. It features an inductance of 27 mH with a tolerance of 30%. The component supports a maximum DC current of 400 mA and has a maximum DC resistance of 1.7 Ohms. Rated for 250 V AC, it operates within a temperature range of -40 °C to +125 °C. The physical dimensions are 18.2 mm in length, 13.2 mm in width, and 20.3 mm in height, utilizing radial termination.

Feature Summary

• Suppresses common-mode interference in compact switch-mode power supplies and converters
• Utilizes ferrite ring core construction for effective electromagnetic compatibility filtering
• Designed for current-compensated operation to handle differential mode currents efficiently

Applications

• Compact switch-mode power supplies
• Power converters of various types
• Electromagnetic compatibility (EMC) filtering in electronic circuits

Procurement Notes

Verify the specific suffix N021 against the manufacturer's latest datasheet to confirm terminal configuration and packaging details. Ensure the selected variant meets the required voltage rating of 250 V AC and current capacity of 400 mA for the target application. Cross-reference the part number with official EPCOS/TDK documentation to avoid confusion with similar series members like B82721A or B82721K which may have different mechanical or electrical characteristics.

Selection Notes

Select this component when designing power lines requiring common-mode noise suppression in space-constrained environments. The 27 mH inductance is suitable for filtering lower frequency interference. Consider the 1.7 Ohm DC resistance for potential voltage drop calculations in low-current circuits. The wide operating temperature range ensures reliability in industrial or automotive contexts where thermal stability is critical for long-term performance.

Part Context

This component belongs to the B82721 series of current-compensated ring core double chokes manufactured by EPCOS, now part of TDK Electronics. These components are specifically engineered for power line applications, offering high inductance values in a compact radial package. The series is widely used in consumer electronics and industrial equipment to meet stringent EMC standards by attenuating common-mode signals effectively.

Replacement Considerations

Check for direct substitutes within the B82721 family, such as B82721A2401N021, ensuring identical inductance and current ratings. Verify that any alternative maintains the same radial pinout and housing dimensions to fit existing PCB layouts without modification.