The **FSLM2520-R15J** is a high-precision, surface-mount (SMD) wire-wound inductor. It is part of the FSLM series, typically manufactured by TDK or similar component specialists, designed for high-frequency signal applications and general-purpose decoupling. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **FSLM** | Series Name | Wire-wound chip inductor for signal lines. | | **2520** | Case Size | Dimensions: 2.5mm x 2.0mm (EIA 1008). | | **R15** | Inductance Value | R denotes the decimal; 0.15 Microhenries ($\mu$H). | | **J** | Tolerance | $\pm$5% accuracy. | --- ### 2. Key Technical Specifications Below are the typical electrical parameters for this specific component: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.15 $\mu$H (150 nH) | | **Tolerance** | $\pm$5% | | **Quality Factor (Q)** | 25 (Minimum at test frequency) | | **Self-Resonant Frequency (SRF)** | ~450 MHz | | **DC Resistance (DCR)** | ~0.44 $\Omega$ (Maximum) | | **Rated Current** | ~380 mA | | **Operating Temperature** | -40°C to +85°C | --- ### 3. Core Features and Construction * **Wire-Wound Structure:** Unlike multilayer inductors, the wire-wound design allows for a higher Q-factor and higher current carrying capacity in a small footprint. * **Resin Molded:** The copper wire is wound around a ceramic or ferrite core and then encapsulated in a hard resin for mechanical protection and moisture resistance. * **Miniature Footprint:** The 2520 (1008) size is ideal for high-density PCB layouts. --- ### 4. Common Applications Due to its high Q-factor and stable inductance at high frequencies, the FSLM2520-R15J is commonly used in: * **RF Circuits:** Impedance matching and resonance in wireless communication modules. * **Signal Processing:** Filtering high-frequency noise in audio/video equipment. * **Telecommunications:** Infrastructure equipment and mobile devices. * **Oscillators:** Used in VCO (Voltage Controlled Oscillator) circuits. ---