LFCN-4400D+

Overview

The LFCN-4400D+ is a low-pass ceramic filter manufactured by Mini-Circuits, designed for RF and microwave applications. It features a cutoff frequency of 4400 MHz (4.4 GHz) with a passband extending from DC. The component operates at a nominal impedance of 50 Ohms and utilizes LTCC technology. It is housed in a compact 4-SMD, no-lead package with dimensions of 3.20mm x 1.60mm x 0.94mm. The device supports DC continuity between input and output terminals, providing high isolation to ground exceeding 100 MOhm.

Feature Summary

• Supports DC continuity between input and output ports
• Provides high isolation to ground exceeding 100 MOhm
• Utilizes LTCC construction for compact surface-mount integration

Applications

• RF signal conditioning in communication systems
• Harmonic suppression in microwave circuits
• Base station front-end filtering

Procurement Notes

Verify the specific suffix 'D' confirms DC continuity requirements, as standard versions may differ. Confirm RoHS3 compliance status for environmental regulations. Ensure the 4-SMD footprint matches the PCB layout constraints. Check lead times as they vary by manufacturer batch. Validate impedance matching for the target 50 Ohm system design.

Selection Notes

Select this model when DC pass-through capability is required alongside low-pass filtering. Compare against non-D variants if DC isolation is preferred. Consider the small form factor for space-constrained designs. Verify attenuation characteristics meet system noise floor requirements. Ensure the operating frequency range aligns with the 4400 MHz cutoff specification.

Part Context

This component belongs to the LFCN series of LTCC low-pass filters from Mini-Circuits. The series offers various cutoff frequencies for different RF bands. The 'D' suffix specifically denotes DC continuity, distinguishing it from AC-coupled counterparts. These filters are part of a broader portfolio covering DC to mmWave frequencies.

Replacement Considerations

Consult Mini-Circuits documentation for direct substitutes within the LFCN series. Verify pinout compatibility for alternative packages. Ensure equivalent electrical performance for critical RF parameters.