## Technical Overview of SD20-3R3-R The **SD20-3R3-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is part of the SD20 series, which is designed for high power density and energy efficiency in compact electronic circuits. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Inductance** | 3.3 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 1.95 Amperes | | **Saturation Current (Isat)** | 2.10 Amperes | | **DC Resistance (DCR)** | 0.0544 Ohms (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | Non-standard SMD (5.2mm x 5.2mm x 2.0mm) | --- ### 2. Core Features and Construction * **Shielded Construction:** The inductor is magnetically shielded, which significantly reduces **Electromagnetic Interference (EMI)**. This makes it ideal for use in noise-sensitive environments like communication devices. * **Low Profile:** With a maximum height of only **2.0 mm**, it is designed for slim electronics where vertical space is limited. * **Ferrite Core:** Utilizes a ferrite core material that provides high efficiency and low core losses at high frequencies. * **SMD Design:** Optimized for surface-mount technology (SMT) with rugged construction for automated assembly. --- ### 3. Applications The SD20-3R3-R is commonly found in the following types of circuits: 1. **DC-DC Converters:** Used as an energy storage element in buck, boost, or buck-boost regulators. 2. **Portable Electronics:** Ideal for smartphones, tablets, and wearables due to its small footprint. 3. **Computer Peripherals:** Used in SSDs, graphics cards, and motherboard power phases. 4. **Battery Powered Systems:** High efficiency helps in extending the battery life of portable tools and sensors. --- ### 4. Part Number Breakdown The part number follows a specific nomenclature: * **SD:** Series name (Shielded Drum Inductor). * **20:** Size code (refers to the 2.0mm height). * **3R3:** Inductance value (3.3 microhenries). * **-R:** RoHS compliant (lead-free). ---