## Overview of CFUKF455KB4X-R0 The **CFUKF455KB4X-R0** is a specific type of **Ceramic Filter** manufactured by **Murata Electronics**. It belongs to the CFUKF series, which are miniaturized, high-performance filters primarily used in the Intermediate Frequency (IF) stage of communication equipment. --- ### 1. Technical Specifications Below are the key electronic parameters for this component: | Parameter | Value / Specification | | :--- | :--- | | **Center Frequency** | 455 kHz | | **3dB Bandwidth** | ± 7.5 kHz min. | | **6dB Bandwidth** | ± 10.0 kHz min. | | **Stop Band Attenuation** | 35 dB min. (within ± 20 kHz) | | **Insertion Loss** | 6.0 dB max. | | **Input/Output Impedance** | 1500 $\Omega$ | | **Operating Temperature** | -20°C to +80°C | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Functional Characteristics * **Selectivity:** The primary role of this part is to provide sharp frequency selectivity. It allows the 455 kHz signal to pass while significantly attenuating (blocking) adjacent channel interference. * **Piezoelectric Effect:** It utilizes the mechanical vibration of piezoelectric ceramics to filter signals. When an electrical signal is applied, the ceramic vibrates at a specific frequency; only signals matching the resonant frequency of the material are transmitted efficiently. * **Compact Design:** The "CFUKF" designation indicates a low-profile, square-shaped SMD package, making it suitable for high-density circuit boards in portable devices. --- ### 3. Application Areas This component is commonly found in the following electronic systems: 1. **Telecommunications:** Handheld transceivers, two-way radios, and pagers. 2. **Radio Receivers:** AM/FM radio receivers utilizing a superheterodyne architecture. 3. **Wireless Data Links:** Low-speed data transmission modules requiring stable IF filtering. 4. **Cordless Phones:** Older generation wireless telephony systems. --- ### 4. Part Number Breakdown (Nomenclature) While Murata part numbers are complex, here is a general breakdown of the identifier: * **CFU:** Ceramic Filter Unit (Type). * **K:** High selectivity/performance series. * **F:** Frequency/Bandwidth characteristics code. * **455:** Center Frequency (455 kHz). * **KB4X:** Specific design/bandwidth variant and internal tolerance. * **R0:** Packaging code (usually refers to Tape and Reel). ---