The **1008F-R20M** is a specific part number for a **Surface Mount (SMD) Wire-wound Inductor**. These components are essential in electronic circuits for energy storage, filtering, and impedance matching. Below is a detailed breakdown of its specifications and characteristics. --- ### 1. Part Number Deciphering The alphanumeric code follows a standard industry format for inductors: | Segment | Meaning | Value / Description | | :--- | :--- | :--- | | **1008** | **Case Size** | 1008 imperial (approx. 2.5 x 2.0 mm) | | **F** | **Type/Material** | Typically Ferrite or Ferrite Core | | **R20** | **Inductance Value** | 0.20 µH (200 nH) | | **M** | **Tolerance** | ±20% | --- ### 2. Key Technical Specifications While exact values can vary slightly by manufacturer (such as API Delevan, Fastron, or Murata), the 1008F series generally shares these parameters: * **Inductance:** 0.20 µH (200 Nanohenries). * **Inductance Tolerance:** ±20% (The "M" suffix). * **Core Material:** Ferrite. This allows for higher inductance in a smaller package compared to ceramic cores. * **Construction:** Wire-wound. A copper wire is wrapped around a rectangular ceramic or ferrite core, providing high Q factors and high current handling. * **Mounting Type:** SMD/SMT (Surface Mount Technology). --- ### 3. Functional Characteristics #### High Q Factor The wire-wound construction allows for a high **Quality Factor (Q)**, which indicates low loss and high efficiency at specific resonant frequencies. #### Self-Resonant Frequency (SRF) Because it is a 200nH inductor, it typically has a high SRF (often above 500 MHz). Designers must ensure the operating frequency is well below the SRF to maintain inductive behavior. #### Current Ratings * **Rated Current (Idc):** The maximum DC current it can handle before the temperature rises significantly or the core saturates. For this size, it is usually between **400mA to 800mA**. * **DC Resistance (DCR):** The internal resistance of the wire. A lower DCR is preferred to prevent power loss (Heat). --- ### 4. Common Applications Due to its small size and ferrite core, the 1008F-R20M is used in: * **RF Tuning:** Oscillators and impedance matching in wireless communication. * **Decoupling:** Filtering high-frequency noise in power supply lines. * **Signal Processing:** High-speed data lines to suppress EMI (Electromagnetic Interference). * **Mobile Electronics:** Smartphones, tablets, and wearables where PCB space is limited. ---