L128XH4S-T

Overview

The L128XH4S-T is a surface mount low-pass filter manufactured by Knowles Dielectric Labs. It operates with a cutoff frequency of 12.8 GHz and provides a bandwidth of 12.5 GHz. The component features an insertion loss of 1.5 dB and maintains a system impedance of 50 Ohms. Designed for board mounting, it utilizes an SMD package configuration without leads.

Feature Summary

• Surface mount construction for automated PCB assembly
• Low insertion loss characteristics for signal integrity
• Defined cutoff frequency for high-frequency filtering

Applications

• RF signal conditioning circuits
• Wireless communication systems
• Microwave instrumentation

Procurement Notes

Verify the specific suffix designation to ensure compatibility with required packaging formats. Confirm that the 50 Ohm impedance aligns with the target circuit design. Check manufacturer documentation for any updates regarding RoHS compliance status or lead-free material declarations before finalizing procurement specifications.

Selection Notes

Select this component when a precise 12.8 GHz cutoff is required for low-pass applications. Ensure the 1.5 dB insertion loss meets the system budget constraints. Verify that the surface mount footprint fits within the available PCB real estate and matches the intended soldering profile requirements.

Part Context

This part belongs to the Knowles Dielectric Labs RF filter portfolio, specifically designed for microwave and millimeter-wave applications. It serves as a passive signal conditioning element used to attenuate frequencies above the specified cutoff point while passing lower frequencies with minimal attenuation.

Replacement Considerations

Consult official substitution guides for compatible alternatives. Verify electrical equivalence including cutoff frequency, bandwidth, and insertion loss parameters before replacing.