## Detailed Overview of the DR74-2R2-R Inductor The **DR74-2R2-R** is a high-performance, shielded power inductor designed by Eaton (formerly Cooper Bussmann/Coiltronics). It belongs to the **DR Series**, which is known for its high power density and electromagnetic interference (EMI) shielding. --- ### 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 2.2 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 5.48 A | | **Saturation Current (Isat)** | 7.35 A | | **DC Resistance (DCR)** | 0.0165 Ω (Max) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Shielded (Magnetic) | | **Package / Case** | 7.6mm x 7.6mm x 4.35mm | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying variations of this part: * **DR**: Series prefix (Drum core, shielded). * **74**: Size code (approx. 7.6mm x 7.6mm footprint, 4.35mm height). * **2R2**: Inductance value (2.2 µH). The "R" acts as a decimal point. * **R**: RoHS compliant. --- ### 3. Key Features & Applications #### Features * **Shielded Construction:** The magnetic shielding minimizes EMI, making it suitable for noise-sensitive circuits. * **High Power Density:** Large current handling capability relative to its small physical footprint. * **Ferrite Core:** Ensures high efficiency and low core losses at high frequencies. #### Typical Applications 1. **DC-DC Converters:** Used as energy storage elements in buck, boost, and buck-boost regulators. 2. **Computer Peripherals:** Found in laptops, servers, and data storage systems. 3. **Consumer Electronics:** Used in high-definition televisions and gaming consoles. 4. **Battery Powered Equipment:** Ideal for portable devices due to its compact size and efficiency. --- ### 4. Comparison with Similar Parts When selecting this part, engineers often compare it against other values in the DR74 series: | Part Number | Inductance (µH) | Isat (A) | DCR (Ω) | | :--- | :--- | :--- | :--- | | **DR74-1R0-R** | 1.0 | 10.4 | 0.009 | | **DR74-2R2-R** | **2.2** | **7.35** | **0.016** | | **DR74-4R7-R** | 4.7 | 5.1 | 0.024 | ---