SRF0905-400Y

Overview

The Bourns SRF0905-400Y is a surface-mount common mode choke from the SRF0905 series, designed for PCB mounting. It features a ferrite core and offers an inductance of 40 µH with a tolerance of ±30%. The component supports a maximum DC current of 900 mA and has a maximum DC resistance of 250 mΩ. It provides an impedance of 800 Ohms at 20 MHz, operating within a frequency range of 20-100 MHz. The device functions across a temperature range of -40°C to +105°C and utilizes a 0905 package measuring 9.2 mm x 6 mm x 5 mm.

Feature Summary

• Utilizes a ferrite core structure for effective common mode noise suppression in high-frequency applications.
• Designed for surface-mount technology (SMD/SMT) integration onto printed circuit boards.
• Provides specific impedance characteristics optimized for filtering within the 20-100 MHz frequency band.

Applications

• Line filtering for electronic circuits requiring common mode noise reduction
• Signal integrity enhancement in data transmission lines
• Electromagnetic interference suppression in compact PCB designs

Procurement Notes

Verify the exact part number suffix against official manufacturer documentation to ensure correct electrical specifications. Confirm that the required inductance value and current rating align with the design constraints. Check for RoHS compliance status if environmental regulations apply to the final assembly. Ensure the selected packaging format matches the automated placement equipment capabilities.

Selection Notes

Select this component when a compact 0905 footprint is required for common mode filtering. Consider the 900 mA current rating and 40 µH inductance for appropriate signal line protection. Evaluate the 20-100 MHz operational bandwidth against the target noise frequencies. Ensure the operating temperature range meets the environmental requirements of the application.

Part Context

This component belongs to the Bourns SRF0905 series of surface-mount common mode chokes. The series is characterized by its small form factor and ferrite core construction. These components are engineered for efficient noise suppression in space-constrained electronic assemblies. The SRF0905 series serves as a specialized solution for managing electromagnetic interference in modern digital systems.

Replacement Considerations

Cross-reference with other SRF0905 series variants such as SRF0905-500Y or SRF0905-202Y if different inductance values are needed. Verify pinout compatibility and physical dimensions before substituting with components from other manufacturers. Ensure equivalent impedance and current ratings are maintained to preserve circuit performance.