The **DR1050-271-R** is a high-performance, shielded power inductor designed primarily for surface-mount (SMD) applications. It belongs to the **DR Series** manufactured by Eaton (formerly Coiltronics). --- ### 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the component: | Parameter | Value | | :--- | :--- | | **Inductance** | 270 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.812 Ω (Typical) | | **Rated Current (Irms)** | 0.77 Amps | | **Saturation Current (Isat)** | 0.92 Amps | | **Shielding** | Magnetically Shielded | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | 10.3mm x 10.5mm x 5.0mm | --- ### 2. Key Features * **Magnetic Shielding:** The part is enclosed in a ferrite core structure, which minimizes Electromagnetic Interference (EMI). This is crucial for densely packed circuit boards where noise can disrupt sensitive components. * **High Power Density:** Despite its small 10mm footprint, it can handle significant current, making it suitable for compact power supplies. * **Drum Core Design:** The "DR" prefix stands for Drum Core. This geometry provides a balance between high inductance values and efficient energy storage. * **Compliance:** The "-R" suffix indicates that the part is **RoHS compliant** (lead-free). --- ### 3. Applications The DR1050-271-R is commonly found in the following electronic circuits: 1. **DC-DC Converters:** Used as a storage element in Buck (step-down), Boost (step-up), and SEPIC converters. 2. **LED Drivers:** Provides constant current smoothing for lighting applications. 3. **Filtering:** Acts as a low-pass filter to remove high-frequency noise from power lines. 4. **Consumer Electronics:** Found in laptops, DVD players, and industrial base stations. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying similar parts: `DR` (Series) + `1050` (Size: 10mm wide, 5.0mm high) + `271` (Inductance: 27 x 10^1 = 270µH) + `-R` (RoHS) ---