FK2125T406AL-T

Overview

The FK2125T406AL-T is a multilayer EMI suppression filter manufactured by Taiyo Yuden. It features an LC (T-type) low-pass configuration with three poles, designed for single-channel signal line protection. The component operates within the 0805 (2012 metric) surface-mount package, measuring 2.0 mm in length, 1.25 mm in width, and 1.05 mm in height. Key electrical specifications include a cutoff frequency of 40 MHz with a tolerance of ±10 MHz, a maximum DC resistance of 2 Ω, and a rated current capacity of 100 mA.

Feature Summary

• Provides effective attenuation of electromagnetic interference through a T-type LC network structure
• Designed for compact integration into high-density PCB layouts using standard 0805 footprints
• Capable of handling continuous DC currents up to 100 mA without performance degradation

Applications

• Signal line filtering in portable electronic devices
• EMI suppression for USB and data interface circuits
• Noise reduction in mobile communication modules

Procurement Notes

Verify component authenticity through authorized distribution channels due to potential counterfeits. Confirm RoHS compliance status via official datasheets before procurement. Ensure storage conditions maintain humidity sensitivity levels appropriate for multilayer ceramic components. Validate package dimensions against PCB silkscreen and footprint requirements to prevent assembly errors during SMT processes.

Selection Notes

Select this component when space-constrained designs require efficient EMI filtering without shielded enclosures. Compare cutoff frequencies against target noise spectra to ensure adequate attenuation at specific interference bands. Evaluate DC resistance impacts on signal integrity for low-voltage logic lines. Consider thermal management requirements given the small form factor and power dissipation characteristics under rated current loads.

Part Context

This part belongs to Taiyo Yuden's FK series of multilayer EMI filters, which utilize proprietary ceramic materials to achieve high capacitance density in miniature packages. The series is engineered for modern electronics where board real estate is limited but regulatory compliance for electromagnetic compatibility remains strict. These filters serve as critical passive components in maintaining signal purity across various consumer and industrial applications.

Replacement Considerations

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