LFCN-6400+

Overview

The LFCN-6400+ is a low-pass ceramic filter with a cutoff frequency of 6400 MHz. It features a 50 Ohm impedance and operates within a temperature range of -55°C to +125°C. The component provides typical passband insertion loss between 1.2dB and 1.9dB, handles up to 1W RF input power, and offers rejection of 20 dB at 8300 MHz. It utilizes an SMD/SMT termination style in a 1206 package.

Feature Summary

• Utilizes LTCC technology for robust RF filtering performance
• Provides high isolation to ground when DC pass configuration is selected
• Supports wide operating temperature ranges suitable for harsh environments

Applications

• S-band upconverter signal conditioning
• RF front-end filtering in satellite communications
• General purpose low-pass filtering in microwave circuits

Procurement Notes

Verify the specific suffix requirements before ordering. The standard model blocks DC, while the 'D' suffix variant supports DC pass-through with over 100 MOhm isolation to ground. Confirm that the 1206 package dimensions align with your PCB layout constraints. Ensure the 1W power handling rating meets your system's maximum input levels to prevent component damage during operation.

Selection Notes

Select this component when a sharp cutoff near 6.4 GHz is required with minimal insertion loss. Consider the 'D' suffix version if DC continuity between input and output is necessary for biasing purposes. Evaluate the thermal management capabilities given the -55°C to +125°C operational range. Compare the 20 dB rejection at 8300 MHz against your specific spurious emission requirements to ensure adequate signal purity.

Part Context

This part belongs to Mini-Circuits' LFCN series of LTCC low-pass filters. These components are designed for high-reliability applications requiring stable performance across wide bandwidths. The series is commonly integrated into complex RF assemblies such as upconverters and downconverters where precise frequency selection is critical for system integrity.

Replacement Considerations

The LFCN-6400 (without the plus sign) may serve as a functional equivalent but lacks RoHS compliance. Verify pinout compatibility and physical footprint alignment before substitution. Check datasheet revisions for any changes in electrical specifications or recommended soldering profiles.