L185XF4W

Overview

The L185XF4W is a low-pass RF filter manufactured by Knowles Dielectric Labs, designed for high-frequency signal conditioning applications. It operates with a cutoff frequency of 18.5 GHz and maintains a standard impedance of 50 Ohms. The component features a compact 6-SMD, no-lead surface-mount package, facilitating board mounting in space-constrained designs. It exhibits a bandwidth specification of 2.2 dB and utilizes wire bond technology for internal connections. The device is RoHS compliant and lead-free, ensuring adherence to environmental standards while providing reliable performance in demanding RF environments.

Feature Summary

• Fully shielded construction to minimize electromagnetic interference
• Wire bond technology for stable internal connectivity
• Compact surface-mount form factor for dense PCB layouts

Applications

• High-frequency wireless communication systems
• RF signal conditioning circuits
• Microwave module integration

Procurement Notes

Verify the specific datasheet version for precise electrical tolerances and thermal characteristics before finalizing design integration. Confirm that the 6-SMD no-lead package dimensions align with your PCB footprint requirements. Ensure handling procedures account for the wire bond construction to prevent mechanical damage during assembly. Cross-reference regulatory compliance documentation to confirm RoHS status for your target market.

Selection Notes

Select this component when a sharp cutoff near 18.5 GHz is required in a minimal footprint. The 50 Ohm impedance matches standard RF transmission lines, simplifying system integration. Consider the fully shielded design if adjacent high-gain stages require isolation. Evaluate the SMT mounting style against manual or automated assembly capabilities to ensure proper soldering profiles for the no-lead package.

Part Context

This part belongs to the Knowles Dielectric Labs family of dielectric resonator filters. These components are engineered for microwave and millimeter-wave frequencies where traditional LC filters lack performance. The L185XF4W specifically targets low-pass filtering needs in modern RF front-ends, offering superior rejection characteristics compared to discrete implementations.

Replacement Considerations

Consult official substitution guides for equivalent low-pass filters from the same manufacturer. Verify that any alternative part maintains the 18.5 GHz cutoff and 50 Ohm impedance. Check pinout compatibility for the 6-SMD configuration to avoid rework.