SRF1280-4R7Y

Overview

The SRF1280-4R7Y is a shielded surface-mount power inductor manufactured by Bourns Inc. It features a composite core construction designed to minimize electromagnetic interference (EMI) and reduce audible noise during operation. The component offers an inductance of 4.7 µH with a tolerance of ±10%. It is rated for a saturation current of 3.5 A and a DC resistance of approximately 60 mΩ. The device utilizes a robust, low-profile package suitable for automated assembly processes.

Feature Summary

• Shielded magnetic structure effectively contains flux to prevent EMI coupling with nearby components.
• Composite core material significantly reduces magnetostriction-induced audible noise compared to traditional ferrite cores.
• Low profile design facilitates placement on high-density printed circuit boards.

Applications

• Point-of-load voltage regulation modules
• DC-to-DC converter output filtering
• Server and workstation power supply circuits

Procurement Notes

Verify the specific ordering suffix matches the required inductance value and tolerance before procurement. Confirm that the package dimensions align with the designated footprint on the target PCB layout. Ensure that the thermal management strategy accounts for the self-heating characteristics under maximum load conditions as specified in the official datasheet.

Selection Notes

Select this component based on the required inductance value and current handling capabilities for the specific power stage. Evaluate the physical space constraints to ensure the low-profile package fits within the allowable height limits. Consider the operating temperature range and the impact of ambient heat on the saturation current rating to maintain stable performance.

Part Context

This part belongs to Bourns' SRF series of shielded power inductors. These components are engineered for applications requiring high efficiency and low noise. The series provides various inductance values and current ratings to support diverse power management architectures in modern electronic devices.

Replacement Considerations

Consult the manufacturer's cross-reference documentation for verified substitute part numbers. Ensure any replacement maintains identical electrical parameters, including inductance, saturation current, and DC resistance. Verify mechanical compatibility regarding footprint and height to avoid rework or redesign requirements.