7121-RC

Overview

The Bourns 7121-RC is a through-hole common mode choke designed for EMI suppression. It features dual windings with an inductance of 42.5 mH at 1 kHz and a maximum DC current rating of 2 A. The component exhibits a maximum DC resistance of 200 mOhms and operates within a temperature range of -55°C to +105°C. It provides high dielectric strength, ensuring robust isolation between windings and the core.

Feature Summary

• Dual winding configuration for two-line applications
• High current capacity supporting demanding power loads
• Low radiation characteristics for signal integrity
• High impedance at low frequencies for effective noise reduction

Applications

• Conductive EMI emission reduction in power supplies
• Signal filtering in industrial control systems
• Noise suppression in automotive electronic circuits

Procurement Notes

Verify the specific datasheet version for the 7121-RC to confirm terminal lead tinning specifications and lead length requirements. Ensure that the mounting header meets VW-1 flame rating standards as specified by the manufacturer. Cross-reference the dielectric strength ratings (3750 Vrms or 1000 Vrms depending on configuration) against your circuit isolation needs before finalizing procurement.

Selection Notes

Select this component when high inductance at low frequencies is required for common mode noise attenuation. The 2 A current rating and 200 mOhm DCR make it suitable for moderate power lines. Verify that the through-hole package fits the PCB layout constraints and that the operating temperature range covers the environmental conditions of the target application.

Part Context

This part belongs to the Bourns Model 7100 Series of common mode chokes. The series is characterized by dual winding designs intended for reducing conductive EMI emissions. The 7121-RC variant specifically offers high inductance and high current capacity, mounted on headers rated for vertical wave soldering processes.

Replacement Considerations

Check for direct substitutes within the 7121 series or other Bourns common mode chokes with matching 42.5 mH inductance and 2 A current ratings. Ensure any replacement maintains the same through-hole footprint and dielectric strength requirements.