## DR74-220-R: Power Inductor Technical Overview The **DR74-220-R** is a high-performance, shielded power inductor manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It is part of the DR series, which is specifically designed for high power density and efficiency in surface-mount applications. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 22.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.0894 Ω (89.4 mΩ) Max | | **Rated Current (Irms)** | 1.94 A | | **Saturation Current (Isat)** | 2.16 A | | **Shielding** | Magnetically Shielded | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Core Features and Construction * **Magnetic Shielding:** The component features a ferrite drum core with a ring sleeve. This construction minimizes Electromagnetic Interference (EMI), making it ideal for noise-sensitive circuits. * **High Power Density:** The "DR74" designation refers to its physical size (approx. 7.6mm x 7.6mm base and 4.35mm height), offering a small footprint relative to its current-carrying capacity. * **Low Core Loss:** Optimized for high-frequency switching, reducing energy wasted as heat. * **Rugged Design:** Designed to withstand high reflow temperatures and harsh environmental conditions. --- ### 3. Common Applications The DR74-220-R is primarily used in power conversion circuits where space is limited and efficiency is critical: 1. **DC-DC Converters:** Acts as an energy storage element in Buck, Boost, and SEPIC topologies. 2. **Computer Peripherals:** Used in laptops, servers, and storage drives. 3. **Battery Powered Devices:** Ideal for portable electronics due to its low DCR and small size. 4. **LED Lighting:** Used in driver circuits to regulate current. --- ### 4. Part Number Breakdown The part number provides specific information about the component's characteristics: | Code Segment | Meaning | | :--- | :--- | | **DR** | Product Series (Drum Core, Shielded) | | **74** | Size Code (Approx. 7.6mm footprint, 4.35mm height) | | **220** | Inductance Code (22 followed by 0 zeros = 22 µH) | | **-R** | RoHS Compliant / Lead-Free | ---