The **DR1050-331-R** is a high-power, shielded surface-mount (SMD) inductor manufactured by Eaton (formerly Coiltronics). It is part of the DR series, which is specifically designed for high-density power applications where space and electromagnetic interference (EMI) are critical factors. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 330 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.810 Ω (Typical) | | **Rated Current (Irms)** | 0.76 Amps | | **Saturation Current (Isat)** | 0.96 Amps | | **Shielding** | Magnetically Shielded | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical Characteristics * **Dimensions:** The "1050" designation refers to the physical size, approximately **10.5mm x 10.3mm** with a height of **5.0mm**. * **Construction:** It features a ferrite drum core with a ferrite sleeve (shield) which minimizes leakage flux, protecting nearby components from noise. * **Mounting:** SMD (Surface Mount Device) with robust soldering pads for high vibration environments. --- ### 3. Part Number Breakdown The part number follows a specific nomenclature: * **DR:** Designates the series (Drum Core, Shielded). * **1050:** Dimensions (10mm diameter, 5.0mm height). * **331:** The inductance value. The first two digits (33) are significant, and the third (1) is the multiplier ($10^1$). So, $33 \times 10 = 330$ µH. * **R:** Indicates the product is RoHS compliant. --- ### 4. Common Applications Due to its high inductance and shielding, this component is typically used in: 1. **DC-DC Converters:** Specifically in buck, boost, or buck-boost topologies for voltage regulation. 2. **Noise Filtering:** Used as an output filter for power supplies to smooth out current ripples. 3. **Industrial Electronics:** Found in LED drivers, motor control circuits, and battery chargers. 4. **Telecommunications:** Used in base stations and networking equipment where EMI must be strictly controlled. ---