1540M04

Overview

The Hammond Manufacturing 1540M04 is a fixed toroidal inductor designed for heavy-duty RF and EMI filtering applications. It features an unshielded radial vertical open lead configuration, suitable for through-hole mounting. The component provides an inductance of 275 µH with a maximum DC resistance of 240 mΩ. It supports a continuous DC current rating of 1.3 A to 2 A, depending on the specific datasheet reference. Constructed as a hash choke within the 1540 series, it offers high current handling capabilities and a minimum length of 0.5 inches, making it appropriate for energy storage in switching power supplies.

Feature Summary

• Provides effective EMI and RFI filtering for electronic circuits
• Designed for use as an energy storage inductor in switching power supplies
• Supports high current operation with robust construction

Applications

• EMI/RFI filtering in industrial electronics
• Energy storage in switching power supply circuits
• Heavy-duty RF choke applications

Procurement Notes

Verify the specific current rating (1.3 A or 2 A) against the manufacturer's official datasheet, as sources vary. Confirm that the unshielded radial vertical package matches the PCB layout requirements. Ensure the 275 µH inductance value meets the circuit design specifications for the intended RF or power application.

Selection Notes

Select this component when a heavy-duty toroidal choke is required for high-current filtering or energy storage. The unshielded design necessitates careful placement to avoid magnetic interference with nearby sensitive components. Verify thermal performance under continuous load conditions, as the radial leads may have specific soldering constraints compared to surface-mount alternatives.

Part Context

The 1540M04 belongs to the Hammond Manufacturing 1540 series of fixed inductors. This series specializes in toroidal coil designs intended for robust industrial environments. Unlike shielded variants, this model utilizes an open construction, which influences its electromagnetic compatibility characteristics and physical footprint within assembly layouts.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.