## Technical Overview of DRQ73-820-R The **DRQ73-820-R** is a high-power density, dual-winding shielded inductor manufactured by **Eaton (Bussmann Division)**. It belongs to the DRQ series, which is specifically designed for applications requiring high efficiency and compact footprints. --- ### 1. Key Technical Specifications | Parameter | Specification Value | | :--- | :--- | | **Inductance** | 82.0 µH (nominal) | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.378 Ω (typical) | | **Isat (Saturation Current)** | ~1.12 A | | **Irms (Rated Current)** | ~0.89 A | | **Dimensions** | 7.6mm x 7.6mm x 3.55mm | | **Core Material** | Ferrite | | **Shielding** | Magnetically Shielded | --- ### 2. Functional Characteristics The DRQ73-820-R is a **Dual Winding** component, meaning it contains two separate coils on a single core. This provides significant flexibility in circuit design: * **Coupled Inductor:** Can be used in SEPIC (Single-Ended Primary-Inductor Converter) or Zeta topologies. * **1:1 Transformer:** Can function as a flyback transformer or for isolation between circuits. * **Series/Parallel Connection:** * **Series:** Increases total inductance (4x the single-winding value if fully coupled). * **Parallel:** Maintains inductance but increases current-handling capability. --- ### 3. Construction and Reliability * **Shielding:** The magnetic shielding minimizes Electromagnetic Interference (EMI), making it suitable for noise-sensitive environments like telecommunications or medical devices. * **Environmental Stability:** It is halogen-free and Lead-free (RoHS compliant). * **Operating Temperature:** Generally rated for -40°C to +125°C, suitable for industrial and automotive-grade environments. --- ### 4. Typical Applications 1. **DC-DC Converters:** Used as the main energy storage element in Buck, Boost, and SEPIC converters. 2. **Power Supplies:** Common in battery-powered handheld devices and industrial controllers. 3. **Filtering:** Used in LC filters for noise suppression in power lines. 4. **Inverters:** High-efficiency power conversion for solar or battery management systems.