7121

Overview

The Bourns Inc. 7121 is a two-line common mode choke designed for printed circuit board mounting. It features a radial termination style and operates with a maximum DC current of 2 A. The component provides an inductance of 42.5 mH at 1 kHz with a tolerance of 15%. Its maximum DC resistance is 200 mOhms, and it exhibits a dielectric strength of 3750 Vrms. The physical width of the unit is 20.32 mm.

Feature Summary

• Reduces conductive electromagnetic interference emissions
• Provides high impedance characteristics at low frequencies
• Supports high current capacity applications

Applications

• Power supply input filtering
• Data line noise suppression
• Industrial equipment EMI mitigation

Procurement Notes

Verify component status as the 7121 is listed as obsolete by some distributors. Confirm RoHS compliance details from official documentation, as sources vary between compliant and non-compliant statuses. Ensure availability through authorized channels given the discontinuation notice. Validate datasheet revisions before integration into new designs.

Selection Notes

Select this component for applications requiring significant low-frequency common mode noise attenuation. The 2 A current rating suits moderate power circuits. Verify that the 42.5 mH inductance meets specific filter requirements. Consider the radial through-hole package constraints during PCB layout planning.

Part Context

This part belongs to the Bourns 7100 series of common mode chokes. It is manufactured under the J.W. Miller trademark. The component falls under the subcategory of inductors, chokes, and coils within the broader magnetic components portfolio.

Replacement Considerations

Consult official substitution guides for equivalent parts. No direct public substitute part numbers are confirmed in the provided data.