The **SD25-1R5-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the SD25 series of surface-mount (SMD) power inductors. ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 1.5 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 3.38 Amperes | | **Saturation Current (Isat)** | 4.86 Amperes | | **DC Resistance (DCR)** | 0.0243 Ohms (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | 5.2mm x 5.2mm x 2.5mm | | **Shielding** | Shielded (Magnetic) | --- ### 2. Core Features and Design * **Magnetic Shielding:** The part is magnetically shielded, which minimizes Electromagnetic Interference (EMI). This is critical for high-density circuit boards where components are packed closely together. * **Ferrite Core:** It uses a ferrite drum core construction which provides high efficiency and high saturation current levels relative to its size. * **Low Profile:** At only 2.5mm in height, it is ideal for thin electronic devices like tablets, ultra-books, and handheld terminals. * **Construction:** It features a robust design capable of withstanding lead-free solder reflow temperatures. --- ### 3. Common Applications The SD25-1R5-R is primarily used as an energy storage element or a filter in power management circuits. * **DC-DC Converters:** Buck, boost, and forward converters. * **Battery Powered Devices:** Smartphones, cameras, and portable media players. * **Computing:** Voltage Regulator Modules (VRMs) for CPUs and GPUs. * **Embedded Systems:** Industrial controllers and IoT sensors requiring stable power rails. --- ### 4. Part Number Breakdown (Nomenclature) To understand the specific variant: * **SD:** Product Series (Shielded Drum). * **25:** Size code (refers to the 2.5mm height). * **1R5:** Inductance Value (1.5 microhenries; "R" acts as the decimal point). * **R:** RoHS compliant / Green material.