## Overview of DRQ73-220-R The **DRQ73-220-R** is a high-power density, dual-winding shielded inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the **DRQ series**, which is specifically designed for applications requiring high efficiency and compact footprints. --- ### 1. Key Technical Specifications The following table outlines the fundamental electronic characteristics of the DRQ73-220-R: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 22.0 µH (nominal) | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.115 Ω (max) | | **Saturation Current ($I_{sat}$)** | 1.83 A | | **RMS Current ($I_{rms}$)** | 1.48 A | | **Configuration** | Dual Winding (Coupled) | | **Shielding** | Magnetically Shielded | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Functional Design & Construction The "Dual Winding" nature of this component makes it versatile compared to standard single-winding inductors. * **Coupled Inductor:** It consists of two separate coils wound on a single ferrite core. * **Magnetically Shielded:** The drum core is enclosed in a ferrite sleeve, which minimizes Electro-Magnetic Interference (EMI) and prevents the magnetic field from affecting nearby components. * **Operating Temperature:** Typically rated for **-40°C to +125°C**, making it suitable for automotive and industrial environments. --- ### 3. Common Circuit Applications Because it has two windings, the DRQ73-220-R can be used in several ways: 1. **1:1 Transformer:** It can be used as an isolation transformer or for signal coupling. 2. **SEPIC Converters:** Ideal for Single-Ended Primary-Inductor Converters where two inductors are required to maintain a constant output voltage regardless of input voltage. 3. **Common Mode Choke:** When wired correctly, it can be used to filter out noise in power lines. 4. **Parallel/Series Connection:** * **Parallel:** Increases current carrying capacity. * **Series:** Increases total inductance. --- ### 4. Naming Convention Breakdown | Part Segment | Meaning | | :--- | :--- | | **DRQ** | Dual Winding, Shielded Drum Core Series | | **73** | Size Code (Approx. 7.6mm x 7.6mm x 3.5mm) | | **220** | Inductance Code (22 followed by 0 zeros = 22 µH) | | **-R** | RoHS Compliant |