The **DR1040-220-R** is a high-performance, shielded power inductor manufactured by **Eaton (formerly Coiltronics)**. It is part of the DR series, which is specifically designed for high-density applications requiring low electromagnetic interference (EMI). ### 1. Key Technical Specifications The part number follows a specific nomenclature. Here is a breakdown of its core parameters: | Parameter | Specification | | :--- | :--- | | **Inductance** | 22.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.054 Ω (Typical) | | **Rated Current (Irms)** | 2.62 A | | **Saturation Current (Isat)** | 2.50 A | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 10.3mm x 10.5mm x 4.0mm | --- ### 2. Physical Construction and Features * **Magnetic Shielding:** The inductor is magnetically shielded. This minimizes EMI, making it ideal for use near sensitive components or in compact PCB layouts. * **Ferrite Core:** It utilizes a ferrite core material which offers low core losses and high efficiency at high switching frequencies. * **Surface Mount (SMD):** Designed for pick-and-place assembly with robust solder pads for mechanical stability. --- ### 3. Common Applications The DR1040-220-R is primarily used in power management circuits where voltage conversion is necessary: * **DC-DC Converters:** Buck, Boost, and SEPIC topologies. * **Computing:** Laptops, servers, and high-end workstations. * **Industrial:** Power supplies and motor control units. * **Consumer Electronics:** LED drivers and portable medical devices. --- ### 4. Part Number Decoding The alphanumeric code provides specific details about the component's build: `DR` | `1040` | `-220` | `-R` ---|---|---|--- **Series** | **Dimensions** | **Inductance Value** | **Compliance** Drum Core Inductor | ~10mm width / 4.0mm height | 22 (value) + 0 (multiplier) = 22µH | RoHS Compliant ---