8121

Overview

The Bourns Inc. 8121 is a through-hole common mode choke belonging to the 8100 series, designed for high-current applications. It features an inductance of 1 mH and supports a current rating of 20 A. The component utilizes a two-line configuration with a low DC resistance of 7 mOhm. Its physical dimensions are 43.18 mm in length and 22.86 mm in width. The unit offers a dielectric strength of 1500 Vrms, ensuring robust isolation capabilities within electronic circuits.

Feature Summary

• Provides effective common mode noise suppression for dual-line configurations
• Engineered for high current handling up to 20 Amperes
• Features high dielectric strength for enhanced electrical isolation

Applications

• Power supply input filtering
• Industrial equipment EMI suppression
• Automotive electronics noise reduction

Procurement Notes

Verify component status as the standard 8121 part number is listed as obsolete or discontinued by major distributors. Confirm availability of alternative suffixes such as 8121-RC if active stock is required. Ensure that any substitute components meet the original 1 mH inductance and 20 A current specifications to maintain circuit integrity and compliance with design requirements.

Selection Notes

Select this component when designing circuits requiring high current capacity and significant common mode noise attenuation. The 20 A rating makes it suitable for power stages where lower-rated chokes would saturate. Consider the through-hole mounting style and specific footprint dimensions during PCB layout to ensure mechanical compatibility with existing assembly processes and enclosure constraints.

Part Context

This component is part of the J.W. Miller brand portfolio under Bourns Inc., specifically within the 8100 series of common mode chokes. These inductors are categorized under passive components used for electromagnetic interference mitigation. The product line focuses on providing reliable magnetic filtering solutions for demanding industrial and automotive environments.

Replacement Considerations

The 8121-RC variant serves as a direct functional replacement within the same series. Verify that the replacement maintains identical inductance, current rating, and physical dimensions to ensure seamless integration without redesigning the printed circuit board or housing.