The **DR1050-120-R** is a high-performance, shielded power inductor designed by Eaton (formerly Coiltronics). It is widely used in DC-DC converters and power management circuits. --- ### 1. Key Technical Specifications The part number itself contains encoded information about its physical size and electrical properties. | Parameter | Specification | | :--- | :--- | | **Inductance** | 12.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.0385 Ω (Typical) | | **Rated Current (Irms)** | 3.32 Amps | | **Saturation Current (Isat)** | 3.90 Amps | | **Shielding** | Magnetically Shielded | | **Package Size** | 10.5mm x 10.3mm x 5.0mm | --- ### 2. Physical Construction & Features * **Magnetically Shielded:** The core is designed to contain the magnetic field. This reduces Electromagnetic Interference (EMI) with neighboring components, making it ideal for high-density PCB layouts. * **Drum Core Technology:** It uses a ferrite drum core with a ring sleeve. This construction provides high power density and low core losses. * **Surface Mount (SMT):** Designed for automated pick-and-place assembly. * **Operating Temperature:** Generally rated for -40°C to +125°C, suitable for industrial and automotive environments. --- ### 3. Application Use Cases This specific inductor (12µH) is typically found in the following electronic circuits: 1. **Buck/Boost Converters:** Acting as the energy storage element in switching regulators. 2. **Output Filters:** Smoothing out current ripples in power supplies. 3. **Battery Powered Equipment:** Handheld devices and laptops where high efficiency and low heat generation are required. 4. **LED Drivers:** Providing stable current to high-brightness LEDs. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying similar components: | Segment | Meaning | | :--- | :--- | | **DR** | Product Family (Drum Core Inductor) | | **1050** | Size Dimensions (approx. 10mm wide, 5.0mm high) | | **120** | Inductance Code ($12 \times 10^0 = 12$ µH) | | **-R** | RoHS Compliant / Lead-Free |