The **DR74-1R5-R** is a high-performance power inductor manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It is part of the DR series, which is known for its shielded construction and high power density. --- ## 1. Technical Specifications The following table highlights the core electrical characteristics of the component: | Parameter | Value | | :--- | :--- | | **Inductance** | 1.5 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.0163 Ω (Max) | | **RMS Current ($I_{rms}$)** | 6.07 Amperes | | **Saturation Current ($I_{sat}$)** | 7.83 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | --- ## 2. Key Features & Construction The DR74-1R5-R is designed for efficiency and durability in compact electronic circuits. ### Magnetically Shielded * The component features a ferrite drum core with a ferrite sleeve. * **Benefit:** This provides magnetic shielding, which minimizes Electromagnetic Interference (EMI) with surrounding components. ### High Power Density * It is designed to handle high peak currents relative to its small physical footprint (approx. 7.6 x 7.6 x 4.35 mm). ### Materials & Compliance * **Lead-free/RoHS Compliant:** Suitable for modern environmentally-friendly manufacturing. * **Halogen Free:** Safe for use in specific sensitive industrial environments. --- ## 3. Common Applications This inductor is typically used in power management circuits where high efficiency and low noise are required: 1. **DC-DC Converters:** Used as an energy storage element in buck (step-down) or boost (step-up) converters. 2. **Computer Peripherals:** Found in laptops, servers, and desktop power stages. 3. **Battery Powered Devices:** Ideal for mobile electronics due to its low DCR, which helps conserve battery life. 4. **Filtering:** Used as an output filter to smooth voltage ripples in switching power supplies. --- ## 4. Part Number Breakdown The part number `DR74-1R5-R` can be decoded as follows: * **DR:** Series name (Drum Core, Shielded). * **74:** Size code (dimensions of the inductor). * **1R5:** Inductance value ($1.5$ microhenries). * **-R:** RoHS compliance indicator.