The **DRA73-330-R** is a high-performance, shielded power inductor designed primarily for automotive and industrial applications. It belongs to the **DRA Series** manufactured by Eaton (formerly Bussmann). --- ### 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 33.0 µH | | **Inductance Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.0894 Ohms (Max) | | **Rated Current (Irms)** | 1.94 Amps | | **Saturation Current (Isat)** | 2.18 Amps | | **Operating Temperature** | -40°C to +165°C | | **Dimensions** | 7.6mm x 7.6mm x 3.55mm | | **Shielding** | Magnetic Shielding (Low EMI) | --- ### 2. Key Features * **AEC-Q200 Qualified:** This is a critical rating for the automotive industry, ensuring the part can withstand high levels of mechanical stress and thermal cycling. * **Magnetic Shielding:** The inductor is enclosed in a ferrite core structure. This minimizes electromagnetic interference (EMI) with surrounding components on the PCB. * **High Temperature Rating:** With a maximum operating temperature of **+165°C**, it is suitable for "under-the-hood" automotive environments where heat is a major factor. * **High Power Density:** Its compact footprint (7.6mm) allows for high current handling relative to its size. --- ### 3. Common Applications The DRA73-330-R is typically used in power management circuits, specifically: 1. **DC-DC Converters:** Acts as an energy storage element in buck (step-down) or boost (step-up) converters. 2. **Automotive Electronics:** Used in ADAS (Advanced Driver Assistance Systems), infotainment, and body control modules. 3. **Industrial Controls:** Power supplies for ruggedized industrial equipment. 4. **LED Lighting:** Constant current drivers for automotive lighting systems. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **DRA:** Series Name (Drum Core, Automotive) * **73:** Size Code (approx. 7mm x 7mm footprint, 3mm height) * **330:** Inductance Code (33 followed by 0 zeros = 33 µH) * **R:** RoHS Compliant / Lead-Free