XLF-861+

Overview

The XLF-861+ is a reflectionless low-pass filter manufactured by Mini-Circuits. It employs a novel topology that absorbs and terminates stop-band signals, preventing signal reflections common in traditional filters. The device operates with a cutoff frequency of 1.15 GHz and is housed in a compact 12-VQFN exposed pad package. Designed for high-performance RF applications, it ensures signal integrity by dissipating out-of-band energy internally rather than reflecting it back into the circuit.

Feature Summary

• Reflectionless design utilizing a novel topology to absorb and terminate stop-band signals
• Low-pass filtering capability with a specified cutoff frequency of 1.15 GHz
• Compact surface-mount construction in a 12-VQFN exposed pad package

Applications

• RF front-end modules requiring minimal signal reflection
• High-performance S-band upconverter assemblies
• Microwave communication systems needing clean spectral output

Procurement Notes

Verify the specific datasheet version when ordering, as Mini-Circuits may update electrical specifications or pin configurations over time. Confirm the package type matches your PCB footprint requirements, specifically the 12-VQFN exposed pad dimensions. Ensure compatibility with your system's thermal management strategy, as the reflectionless design dissipates stop-band power internally within the component.

Selection Notes

Select this component when minimizing reflected signals is critical for system stability and noise performance. The XLF-861+ is suitable for designs where traditional reflective filters might cause impedance mismatches or oscillation. Consider its 1.15 GHz cutoff relative to your desired passband and the need for internal termination of harmonic or out-of-band interference without external matching networks.

Part Context

Mini-Circuits specializes in RF, IF, and microwave components ranging from DC to 86 GHz. The XLF series represents their advanced filter technologies, focusing on integration and performance. This model belongs to the reflectionless filter family, which addresses limitations of conventional LC filters by providing superior stop-band rejection through internal signal absorption rather than reflection.

FAQ

How does the XLF-861+ handle stop-band signals?

It uses a reflectionless topology that absorbs and terminates stop-band signals internally, preventing them from reflecting back into the source.

What is the primary advantage of this filter over standard low-pass filters?

The primary advantage is the elimination of signal reflections, which improves system stability and reduces noise in sensitive RF circuits.