## CFWKA450KBFY001-R0: Electronic Component Overview The **CFWKA450KBFY001-R0** is a specific type of **Ceramic Filter** manufactured by **Murata Electronics**. It belongs to the **CFWKA** series, which are miniaturized, high-performance ceramic filters primarily used in the Intermediate Frequency (IF) stage of radio communication equipment. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Center Frequency (fo)** | 450 kHz | | **Bandwidth (at 6dB)** | ±2.0 kHz min (Total 4.0 kHz) | | **Bandwidth (at 50dB)** | ±7.5 kHz max | | **Insertion Loss** | 6.0 dB max | | **Input/Output Impedance** | 3.0 kΩ | | **Operating Temperature** | -20°C to +80°C | | **Mounting Type** | Surface Mount Device (SMD) | --- ### 2. Functional Description A ceramic filter acts as a **Band-pass Filter**. Its job is to allow signals within a specific frequency range (around 450 kHz) to pass through while significantly attenuating (blocking) signals outside that range. * **Piezoelectric Effect:** The device utilizes the mechanical resonance of piezoelectric ceramics. When an electrical signal is applied, the ceramic vibrates; it only allows frequencies that match its physical resonance to pass to the output side efficiently. * **Selectivity:** With a 50dB bandwidth of only ±7.5 kHz, this filter provides high "selectivity," meaning it is excellent at filtering out noise from adjacent channels in radio communication. --- ### 3. Application Areas The CFWKA450KBFY001-R0 is typically found in narrowband communication devices: 1. **Two-way Radios:** Used in professional walkie-talkies and land mobile radios. 2. **Pagers:** Filtering the IF signal in paging receivers. 3. **AM Receivers:** Specifically for narrow-band AM or SSB (Single Side Band) communications. 4. **Cordless Phones:** Used in older analog wireless communication systems. --- ### 4. Part Number Breakdown (Typical Murata Nomenclature) | Code Segment | Meaning | | :--- | :--- | | **CFWKA** | Series Name (Ceramic Filter, Surface Mount) | | **450K** | Nominal Center Frequency (450 kHz) | | **BFY** | Characteristics/Bandwidth Code | | **001-R0** | Packaging code (usually refers to Tape & Reel) | --- ### 5. Circuit Design Tip When integrating this part into a circuit, ensure that the **source and load impedances** match the specified **3.0 kΩ**. If the impedance is mismatched, the filter will exhibit higher insertion loss and distorted frequency response (ripples in the passband).