The **FSLM2520-R82J** is a high-precision wire-wound surface mount (SMD) inductor, typically manufactured by companies like **TDK**. It is widely used in radio frequency (RF) and signal processing circuits. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify its technical boundaries: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **FSLM** | Series Name | Wire-wound chip inductor for signal lines | | **2520** | Case Size (Metric) | 2.5mm x 2.0mm (EIA 1008 equivalent) | | **R82** | Inductance Value | 0.82 $\mu$H | | **J** | Tolerance | ±5% | --- ### 2. Technical Specifications The electrical characteristics are designed for stability and high performance in compact environments: * **Inductance:** 0.82 $\mu$H * **Tolerance:** ±5% (Standard precision) * **Quality Factor (Q):** Typically 30 (Min) at a test frequency of 25.2 MHz. * **Self-Resonant Frequency (SRF):** Approximately 145 MHz (Minimum). * **DC Resistance (DCR):** Max 0.85 $\Omega$. * **Rated Current:** Approximately 320 mA. * **Operating Temperature:** -40°C to +85°C. --- ### 3. Key Physical Features * **Construction:** Wire-wound around a ceramic or ferrite core. The winding is protected by a resin mold (molded type) to provide mechanical strength and moisture resistance. * **Form Factor:** The 2520 (1008) size is small enough for modern portable electronics while still allowing for a high Q-factor compared to multilayer inductors. * **Terminations:** Usually tin-plated (Pb-free) to support lead-free soldering processes (Reflow). --- ### 4. Common Applications Due to its stable inductance and high Q-factor at high frequencies, the FSLM2520-R82J is found in: 1. **RF Circuits:** Matching networks and filters in communication equipment. 2. **Signal Decoupling:** Removing high-frequency noise from signal lines. 3. **Consumer Electronics:** Found in TVs, VCRs, and mobile communication devices. 4. **Tuning Circuits:** Used in oscillators and resonant circuits. ---