The **SFPKA455KD4A-R1** is a specialized electronic component primarily used in communication technology. It is a **Ceramic Filter** manufactured by **Murata Electronics**. --- ### 1. General Specifications This part belongs to the "SF" series of ceramic filters, which are designed to improve selectivity in radio frequency (RF) circuits. | Parameter | Specification | | :--- | :--- | | **Component Type** | Ceramic Filter | | **Center Frequency** | 455 kHz | | **Bandwidth (6dB)** | ±10.0 kHz min | | **Selectivity (50dB)** | ±20.0 kHz max | | **Insertion Loss** | 4.0 dB max | | **Input/Output Impedance** | 1.5 kΩ | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Key Electronic Characteristics The SFPKA455KD4A-R1 is designed to operate within the Intermediate Frequency (IF) stage of a receiver. * **Piezoelectric Effect:** The device utilizes the mechanical resonance of piezoelectric ceramics to filter out unwanted frequencies. * **Selectivity:** It is highly effective at isolating the desired signal while suppressing noise and adjacent channel interference. * **Miniaturization:** As an SMD (Surface Mount Device) component, it is designed for automated assembly on high-density PCBs. * **Temperature Stability:** Ceramic filters are preferred over LC (Inductor-Capacitor) circuits because they offer better stability against temperature fluctuations and mechanical aging. --- ### 3. Typical Applications These components are commonly found in telecommunication devices that require precise frequency management: 1. **AM Radio Receivers:** Used in the IF (Intermediate Frequency) stage to extract audio signals. 2. **Wireless Communication:** Found in pagers, cordless phones, and two-way radios. 3. **Remote Control Systems:** Used in industrial remote controls where 455 kHz is a standard IF. --- ### 4. Part Number Breakdown (Nomenclature) * **SF:** Ceramic Filter * **PK:** Series Code (Specific package/style) * **455:** Center Frequency (455 kHz) * **K:** Bandwidth/Characteristics code * **R1:** Packaging style (typically refers to Tape & Reel) ---