## Electronic Specifications: DR1050-390-R The **DR1050-390-R** is a high-power, shielded surface-mount (SMD) inductor part of the DR series manufactured by **Eaton (formerly Bussmann)**. It is specifically designed for high-density power applications where space and EMI (Electromagnetic Interference) shielding are critical. --- ### 1. Key Technical Specifications The following table details the primary electrical characteristics of the component: | Parameter | Value | Notes | | :--- | :--- | :--- | | **Inductance** | 39.0 µH | Measured at 100 kHz, 0.1 Vrms | | **Tolerance** | ±20% | Standard for power inductors | | **Rated Current ($I_{rms}$)** | 1.86 Amps | Current causing a 40°C temperature rise | | **Saturation Current ($I_{sat}$)** | 2.14 Amps | Current causing a 30% drop in inductance | | **DC Resistance (DCR)** | 0.126 $\Omega$ | Maximum value at 20°C | | **Operating Temperature** | -40°C to +125°C | Includes self-heating | --- ### 2. Component Features * **Magnetic Shielding:** The inductor is fully shielded, which minimizes EMI and allows for high-density placement on the PCB without interfering with nearby sensitive components. * **Construction:** It uses a ferrite drum core with a ceramic base and a metal sleeve for shielding. * **Size Profile:** The "1050" designation refers to its dimensions, approximately **10.5mm x 10.3mm** with a height of **5.0mm**. * **Compliance:** The "-R" suffix indicates that the part is **RoHS compliant** (lead-free). --- ### 3. Common Applications The DR1050-390-R is typically found in the following electronic circuits: 1. **DC-DC Converters:** Used as an energy storage element in buck, boost, or SEPIC converters. 2. **Output Filters:** Smoothing high-frequency noise in switching power supplies. 3. **Battery Powered Equipment:** Used in hand-held devices due to its compact size and efficiency. 4. **Computing & Industrial:** Found in servers, telecommunications, and industrial automation control boards. --- ### 4. Mounting & Soldering * **Package Type:** SMD (Surface Mount Device). * **Reflow Profile:** Compatible with standard lead-free solder reflow profiles (J-STD-020).