RN143-4-02

Overview

The Schaffner RN143-4-02 is a current-compensated common mode choke from the RN series, designed for power line filtering. It features an inductance of 3.9 mH at 1 kHz and supports a maximum DC current of 4 A. The component has a typical DC resistance of 58 mΩ and operates within a temperature range of -40°C to +100°C. Measuring 33 mm x 33.1 mm x 19.7 mm, it utilizes a ferrite core and is intended for through-hole PCB mounting.

Feature Summary

• Provides effective common mode noise suppression for power lines
• Utilizes a current-compensated design with a ferrite core
• Supports high current handling capabilities up to 4 A

Applications

• Power supply input filtering
• Battery charger circuits
• Portable device power regulation

Procurement Notes

Verify the specific inductance tolerance and DC resistance values against the official datasheet, as variations may exist between manufacturing batches or regional specifications. Confirm that the through-hole footprint dimensions match the target PCB layout before finalizing procurement decisions.

Selection Notes

Select this component when a 3.9 mH inductance is required for 4 A applications. Ensure the operating environment stays within the specified -40°C to +100°C range. Verify that the unshielded design does not interfere with nearby sensitive components due to potential magnetic field emission.

Part Context

This part belongs to the Schaffner RN series of common mode chokes, manufactured by TE Connectivity / Schaffner. The series offers various inductance and current ratings for EMC/EMI compliance in power electronics.

Replacement Considerations

RN143-4-02-3M9 is a documented variant with similar electrical characteristics. Verify pinout compatibility and physical dimensions before substitution.