The **FL201209-R82K** is a surface-mount multilayer ferrite chip inductor. These components are primarily used for high-frequency filtering and noise suppression in compact electronic devices. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **FL** | Series Type | Multilayer Ferrite Inductor (General Purpose) | | **2012** | Dimensions | Metric size 2012 (equivalent to EIA **0805** package) | | **09** | Thickness | Approximately 0.9 mm | | **R82** | Inductance Value | **0.82 µH** (R denotes the decimal point) | | **K** | Tolerance | **±10%** | --- ### 2. Technical Specifications Below are the typical electrical parameters for this specific component: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.82 µH | | **Tolerance** | ±10% | | **Test Frequency** | 25 MHz | | **DC Resistance (DCR)** | ~0.45 Ω (Max) | | **Rated Current** | ~150 mA - 200 mA | | **Self-Resonant Frequency (SRF)** | > 75 MHz | | **Operating Temperature** | -40°C to +85°C | --- ### 3. Key Features and Construction * **Multilayer Structure:** The inductor is created by layering ceramic/ferrite materials with internal silver paste electrodes. This creates a monolithic, solid structure that is highly reliable. * **Magnetic Shielding:** Because it is a ferrite body, the magnetic flux is contained within the component, minimizing electromagnetic interference (EMI) with neighboring components. * **Miniature Size:** The 0805 (2.0mm x 1.25mm) footprint is ideal for high-density PCB layouts. --- ### 4. Common Applications This part is generally used in low-power signal lines rather than power conversion stages: 1. **EMI Suppression:** Filtering high-frequency noise in communication lines. 2. **Signal Conditioning:** Used in RF circuits and oscillators to maintain signal integrity. 3. **Consumer Electronics:** Found in mobile phones, tablets, and wearable tech where space is limited. 4. **Decoupling:** Preventing noise from digital ICs from entering the power rail.