The **SFSKB2M30GF00-R1** is a surface-mount (SMD) **Ceramic Filter** manufactured by **Murata Electronics**. It belongs to the SFECV/SFSKB series, which are designed for small-size, high-performance frequency selection in communication equipment. --- ### 1. General Specifications This component is primarily used in FM receivers for intermediate frequency (IF) stage filtering. | Parameter | Value / Description | | :--- | :--- | | **Manufacturer** | Murata Electronics | | **Part Type** | Ceramic Filter (SMD) | | **Center Frequency (fo)** | 2.300 MHz (Typical) | | **Bandwidth (at 3dB)** | $\pm$ 30 kHz (Approx.) | | **Insertion Loss** | 5.5 dB max (at fo) | | **Impedance** | 1000 $\Omega$ (Input/Output) | | **Package Size** | 4.5 x 3.2 x 2.0 mm | --- ### 2. Key Features and Construction * **Piezoelectric Technology:** It utilizes the mechanical resonance of piezoelectric ceramics to filter electrical signals, allowing only a specific band of frequencies to pass. * **Surface Mount Design:** The "SKB" series is optimized for automated pick-and-place assembly, saving PCB real estate compared to traditional leaded filters. * **High Selectivity:** Designed to provide a sharp "skirt" characteristic, effectively eliminating noise and adjacent channel interference. * **Environmental Stability:** Built to withstand standard reflow soldering temperatures and maintain frequency stability across a wide temperature range. --- ### 3. Application Areas These filters are commonly found in: 1. **Consumer Electronics:** FM radio tuners and digital broadcasting receivers. 2. **Wireless Communication:** Paging systems and low-frequency transceivers. 3. **Intermediate Frequency (IF) Stages:** Used in superheterodyne receivers to isolate the target signal after down-conversion. --- ### 4. Technical Diagram (Simplified Pinout) While specific to the SMD footprint, the internal structure typically involves: ```text [Input] ---- [Ceramic Resonator Element] ---- [Output] | [Ground] ``` ---