The **SDQ25-R47-R** is a high-performance, low-profile, shielded surface-mount (SMD) inductor. It belongs to the SDQ series, which is specifically designed for high-density power applications where space is limited and electromagnetic interference (EMI) must be minimized. Below is a detailed breakdown of its specifications and features. --- ### 1. Technical Specifications The part number follows a specific nomenclature. Here are the core electrical characteristics for the **R47** (0.47 µH) variant: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~18.5 mΩ (Max) | | **Rated Current (Irms)** | ~4.12 Amps | | **Saturation Current (Isat)** | ~5.80 Amps | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 5.2mm x 5.2mm x 2.5mm | --- ### 2. Key Features * **Magnetically Shielded:** The inductor is enclosed in a ferrite housing. This minimizes leakage flux, protecting nearby sensitive components from EMI. * **Dual Winding Capability:** The "SDQ" series often features two windings that can be connected in series or parallel, allowing for versatility as an inductor, a 1:1 transformer, or a common-mode choke. * **Low Profile:** With a height of only 2.5mm, it is ideal for thin electronic devices like tablets and slim power modules. * **High Power Density:** It handles significant current relative to its physical footprint. --- ### 3. Part Number Breakdown Understanding the suffix and prefix helps in identifying the exact component: * **SDQ25:** Refers to the series and physical size (approx. 5.2mm sq, 2.5mm height). * **R47:** Represents the inductance value. The "R" acts as a decimal point ($0.47$ microhenries). * **R:** The final "R" usually denotes compliance with RoHS (Reduction of Hazardous Substances) standards and indicates it is lead-free. --- ### 4. Common Applications This component is typically found in: 1. **DC-DC Converters:** Used as a storage inductor in buck or boost regulators. 2. **Battery Powered Devices:** Smartphones, handheld GPS units, and wearable tech. 3. **LED Drivers:** Providing stable current for lighting systems. 4. **SEPIC Topologies:** Because it can function as a dual-winding coupled inductor.