LQH43MN3R9M03L

Fixed Inductors Overview

The Murata LQH43MN3R9M03L is an unshielded, wirewound RF inductor designed for surface-mount applications. It features a ferrite drum core and operates within a temperature range of -40°C to +85°C. The component provides an inductance of 3.9 µH with a tolerance of ±20%. Key electrical specifications include a maximum DC current rating of 500 mA, a maximum DC resistance of 380 mΩ, and a minimum Q factor of 20 at 1 MHz. The self-resonant frequency is specified at 47 MHz. The device is housed in a standard 1812 (4532 metric) package.

Fixed Inductors Feature Summary

• Unshielded wirewound construction utilizing a ferrite drum core
• Designed for high-current and high-inductance power applications
• Suitable for compact PCB layouts via standard SMD mounting

Fixed Inductors Applications

• Mobile phone power circuits
• Digital camera power management
• Television power supplies

Fixed Inductors Procurement Notes

Verify the specific suffix '03L' against official Murata documentation to confirm tape and reel packaging details. Ensure the selected variant matches the required 1812 footprint and thermal characteristics for the target design environment.

Fixed Inductors Selection Notes

Select this component when an unshielded inductor is acceptable to minimize size and cost while requiring moderate current handling. The 1812 package offers a balance between current capacity and board space efficiency compared to smaller footprints.

Fixed Inductors Part Context

This part belongs to the Murata LQH43 series of fixed RF inductors. The series is characterized by its wirewound technology and suitability for general-purpose power filtering in consumer electronics where magnetic shielding is not strictly required.

Fixed Inductors Replacement Considerations

Direct substitutes may include other 1812 unshielded wirewound inductors with similar 3.9 µH values and current ratings, such as those from Bourns or TDK, provided they meet the same thermal and electrical constraints.