## Detailed Overview of DRA73-4R7-R The **DRA73-4R7-R** is a high-power, shielded drum core inductor manufactured by **Eaton (formerly Coiltronics)**. It is part of the **DRA Series**, which is specifically designed for high-temperature automotive applications and power electronics. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of the component: | Parameter | Value | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 3.97 Amps | | **Saturation Current (Isat)** | 4.88 Amps | | **DC Resistance (DCR)** | 23.3 mΩ (Typical) | | **Operating Temperature** | -40°C to +165°C | | **Package / Case** | 7.6mm x 7.6mm x 3.55mm | | **Shielding** | Shielded (Magnetic) | --- ### 2. Functional Characteristics * **Shielded Construction:** The magnetic shielding minimizes Electromagnetic Interference (EMI), making it ideal for densely packed circuit boards where noise can affect surrounding components. * **AEC-Q200 Qualified:** This part meets the rigorous stress-resistance standards required for the automotive industry. * **High Temperature Stability:** With a maximum operating temperature of **165°C**, it is designed to maintain performance under extreme heat conditions (e.g., engine compartments). * **Low DCR:** The low DC resistance ensures high efficiency and minimal power loss through heat dissipation. --- ### 3. Applications The DRA73-4R7-R is commonly utilized in the following scenarios: 1. **Automotive Electronics:** Engine control units (ECUs), LED lighting drivers, and infotainment systems. 2. **DC-DC Converters:** Acts as an energy storage element in buck, boost, or buck-boost regulators. 3. **Power Supplies:** Used in industrial power modules and telecommunications equipment. 4. **Noise Filtering:** Effective in LC filters to smooth out ripple current in power lines. --- ### 4. Part Number Breakdown The nomenclature **DRA73-4R7-R** can be interpreted as follows: * **DRA:** Series name (Automotive High Power Inductor). * **73:** Size code (Approx. 7mm width and 3mm height). * **4R7:** Inductance value (4.7 µH, where 'R' represents the decimal point). * **-R:** RoHS compliant (Lead-free). ---