## SFECF10M7DF00S0-R0 Technical Overview The **SFECF10M7DF00S0-R0** is a high-performance **Ceramic Filter** manufactured by **Murata Electronics**. It belongs to the **SFECF series**, which is specifically designed for FM intermediate frequency (IF) stages in compact electronic devices. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Center Frequency (fo)** | 10.700 MHz | | **3dB Bandwidth** | 230 kHz ± 50 kHz | | **Insertion Loss** | 3.0 dB max. | | **Spurious Response** | 35 dB min. (9-12 MHz) | | **Input/Output Impedance** | 330 $\Omega$ | | **Operating Temperature** | -20°C to +80°C | | **Package Type** | Surface Mount (SMD) | | **Dimensions** | 3.45 x 3.10 x 1.40 mm | --- ### 2. Core Components and Operation The device operates based on the **piezoelectric effect**. Below are the electronic aspects of its construction: * **Piezoelectric Ceramic Substrate:** The heart of the filter is a ceramic plate that vibrates at a specific frequency (10.7 MHz) when an electrical signal is applied. * **Energy Trapping Technology:** Murata uses a specific vibration mode where the acoustic energy is trapped within the electrode area. This allows for high selectivity and low interference from surrounding frequencies. * **Monolithic Structure:** The "CF" in the part number indicates a monolithic crystal-like structure, ensuring high stability and aging characteristics compared to traditional LC filters. --- ### 3. Application and Circuit Integration This part is primarily used in the **IF (Intermediate Frequency) section** of FM receivers. #### Typical Circuit Configuration In a standard FM radio circuit, the filter is placed between the Mixer and the FM Demodulator (IC). ```text [Antenna] -> [RF Amp] -> [Mixer] -> [SFECF10M7 Filter] -> [FM IF Amp/Detector] ``` * **Impedance Matching:** To achieve the rated bandwidth and ripple characteristics, the input and output must be matched to **330 $\Omega$**. If the driving circuit has a different impedance, resistors or matching networks must be used. * **Selectivity:** This specific model (DF00) provides a standard bandwidth (230kHz), which is ideal for high-fidelity FM broadcasting where audio quality and channel separation are priorities. --- ### 4. Part Number Breakdown * **SFECF**: Series code for SMD Ceramic Filters (Small Type). * **10M7**: Center frequency (10.7 MHz). * **DF00**: Designates the specific bandwidth and attenuation characteristics. * **R0**: Refers to the packaging style (usually 180mm diameter plastic tape reel).