The **FSLM2520-R18J** is a high-precision Surface Mount Device (SMD) wire-wound chip inductor. It is part of the FSLM series, typically manufactured by TDK or similar component specialists, designed specifically for high-frequency signal processing and filtering. --- ### 1. Key Technical Specifications Below are the electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Inductance** | 0.18 µH (180 nH) | | **Tolerance** | ±5% (indicated by 'J') | | **Case Size (EIA)** | 1008 | | **Case Size (Metric)** | 2520 (2.5mm x 2.0mm) | | **Self-Resonant Frequency** | ~400 MHz (typical) | | **DC Resistance (DCR)** | ~0.35 Ω (Max) | | **Rated Current** | ~450 mA | | **Construction** | Wire-wound with Resin Mold | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying variations of the part: * **FSLM**: Series name (typically denotes a molded, wire-wound inductor). * **2520**: Dimensions in millimeters (2.5mm length × 2.0mm width). * **R18**: Inductance value. "R" acts as the decimal point (R18 = 0.18 µH). * **J**: Tolerance code. J represents ±5% (K would be ±10%). --- ### 3. Construction and Features * **Molded Shielding**: The wire coil is encapsulated in a synthetic resin. This provides excellent mechanical strength and protects the fine wire from environmental factors and handling damage during automated assembly. * **High Q Factor**: Because it is wire-wound (rather than multilayer), it maintains a high Quality (Q) factor, making it efficient for RF tuning and frequency selection. * **Dimensional Accuracy**: The 2520 footprint is standardized for pick-and-place machines, ensuring high reliability in mass production. --- ### 4. Common Applications Due to its high resonance and stability, this inductor is used in: 1. **Telecommunications**: Mobile phones, wireless LANs, and Bluetooth modules. 2. **RF Circuits**: Matching circuits, oscillators, and signal filters. 3. **Consumer Electronics**: Used in video cameras, portable audio, and GPS units to prevent high-frequency noise interference. ---