1540M21

Overview

The Hammond Manufacturing 1540M21 is a fixed inductor from the 1540 series, designed as an RF choke and heavy-duty hash choke. It features a toroidal core construction with unshielded windings to minimize electromagnetic interference coupling. The component utilizes radial vertical open mounting for printed circuit board integration. Key electrical specifications include an inductance of 250 µH and a maximum DC resistance of 41 mOhm. It supports a continuous DC current rating of 4.75 A, ensuring stable performance under high-load conditions typical in power supply filtering applications.

Feature Summary

• Toroidal core design for efficient magnetic flux containment
• Heavy-duty construction suitable for high-current environments
• Radial vertical open lead configuration for PCB mounting

Applications

• EMI/RFI filtering circuits
• Energy storage in switching power supplies
• Hash choke applications in radio frequency systems

Procurement Notes

Verify part authenticity through authorized distributors or direct manufacturer channels. Confirm that the received component matches the 1540M21 designation and exhibits the specified 250 µH inductance and 4.75 A current rating. Inspect leads for integrity and ensure packaging protects against mechanical damage during transit. Cross-reference datasheet revisions to confirm compliance with current technical standards before integration into production designs.

Selection Notes

Select this component when designing circuits requiring robust RF chokes with high current handling capabilities. The 250 µH value and 4.75 A rating make it suitable for power supply filtering where significant energy storage is needed. Consider the unshielded nature of the toroid when layout planning is required to manage potential magnetic field interactions with nearby sensitive components.

Part Context

This component belongs to the Hammond Manufacturing 1540 series of high-current toroid inductors. The series is characterized by its ability to handle substantial DC currents while maintaining stable inductance values. These inductors are engineered for industrial and commercial electronic equipment requiring reliable filtering and energy storage solutions in compact form factors.

Replacement Considerations

Consult official Hammond Manufacturing documentation for verified substitute part numbers within the 1540 series or equivalent product lines. Ensure any replacement maintains identical inductance, current rating, and physical mounting dimensions to guarantee compatibility with existing circuit designs and PCB layouts.