The **CDBKB455KCLX39-R0** is a specific surface-mount (SMD) ceramic discriminator manufactured by **Murata Electronics**. It is primarily used in FM demodulation circuits to convert frequency variations into audio or data signals. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Manufacturer** | Murata Electronics | | **Component Type** | Ceramic Discriminator | | **Center Frequency (fo)** | 455 kHz | | **Package Type** | SMD (Surface Mount Device) | | **Dimensions** | Approx. 4.5 x 5.2 x 2.0 mm | | **Operating Temperature** | -20°C to +80°C | | **Demodulation Bandwidth** | ±4.0 kHz min. (at 3dB) | --- ### 2. Functional Overview A ceramic discriminator acts as a resonant element in FM detection stages. Unlike a standard filter which blocks frequencies, the discriminator works with an IC (Integrated Circuit) to create a phase shift. * **Detection Method:** It is typically paired with FM IF (Intermediate Frequency) ICs (like those from Toshiba or NXP) to form a **Quadrature Detection** circuit. * **Frequency Response:** It is tuned specifically to **455 kHz**, which is the standard intermediate frequency for narrowband FM communication. ### 3. Common Applications This part is commonly found in communication equipment where space is at a premium and high reliability is required: 1. **Two-way Radios:** Handheld walkie-talkies and mobile transceivers. 2. **Pagers:** Legacy wireless messaging devices. 3. **Cordless Phones:** Standard analog or early digital cordless systems. 4. **Narrowband Receivers:** Various industrial telemetry and remote control systems. ### 4. Part Number Breakdown While Murata codes are complex, the string conveys specific data: * **CDB**: Ceramic Discriminator. * **KB**: Specific series/material characteristics. * **455**: Center frequency in kHz. * **KCLX**: Tolerance and bandwidth grade. * **R0**: Packaging code (usually refers to Tape & Reel for automated assembly). ---