BK20104M121-T

Overview

The BK20104M121-T is a multilayer chip ferrite bead array manufactured by Taiyo Yuden. It features four independent lines within an 0804 (2010 metric) surface-mount package. The component provides an impedance of 120 Ohms at 100 MHz and supports a maximum current rating of 100 mA. Its DC resistance is specified at 0.3 Ohms maximum. The device operates reliably within a temperature range of -55°C to 125°C.

Feature Summary

• Four independent filtering channels integrated into a single compact footprint
• High impedance characteristics for effective noise suppression in high-frequency circuits
• Robust thermal stability suitable for demanding industrial environments

Applications

• Data line protection in portable electronic devices
• Noise suppression on clock signals in digital systems
• EMI filtering in automotive infotainment modules

Procurement Notes

Verify the obsolete status of this specific part number before initiating procurement actions, as manufacturing may have ceased. Confirm that alternative sources or substitute components meet the required electrical specifications and physical dimensions. Ensure compliance with RoHS3 standards if applicable to your supply chain requirements.

Selection Notes

Select this component when space constraints require multiple filtered lines in a small package. The 0804 size offers a balance between current handling and footprint reduction. Verify that the 100 mA current rating aligns with the target circuit's operational demands to prevent saturation or excessive heating.

Part Context

This component belongs to Taiyo Yuden’s BK series of multilayer chip bead arrays. These components are designed to replace discrete ferrite beads, saving board space and assembly time. The BK series is widely used in consumer electronics and industrial applications requiring reliable EMI/RFI suppression across multiple signal lines simultaneously.

Replacement Considerations

The BLA31AG121SN4D from Murata Electronics is listed as a direct substitute. Verify pin compatibility and impedance tolerance matches before substitution.