The **SD53-3R3-R** is a specific model of a surface-mount power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the SD53 series, known for being magnetically shielded and having a low profile. ### 1. Component Overview The part number can be broken down to understand its characteristics: | Segment | Meaning | Details | | :--- | :--- | :--- | | **SD** | Series Name | SD Series (Standard Inductor) | | **53** | Dimensions | Approx. 5.2mm x 5.2mm (Footprint) x 3.0mm (Height) | | **3R3** | Inductance Value | **3.3 μH** (R denotes the decimal point) | | **-R** | RoHS Compliant | Indicates the part is lead-free and compliant with environmental standards | --- ### 2. Key Technical Specifications Below are the typical electrical and physical parameters for the SD53-3R3-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 3.3 μH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.038 Ω (38 mΩ) | | **Saturation Current ($I_{sat}$)** | ~2.54 A (Current where inductance drops by 30%) | | **RMS Current ($I_{rms}$)** | ~2.23 A (Current causing a 40°C temperature rise) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded (Low EMI) | --- ### 3. Construction and Features * **Magnetically Shielded:** The core construction minimizes electromagnetic interference (EMI), making it ideal for high-density boards where components are packed closely together. * **Ferrite Core:** Utilizes a ferrite drum core with a ferrite sleeve to provide high efficiency and high saturation levels. * **Surface Mount (SMD):** Designed for automated pick-and-place assembly. --- ### 4. Common Applications This inductor is generally used in DC-DC converters and power management circuits for: 1. **Consumer Electronics:** Laptops, tablets, and handheld gaming consoles. 2. **Storage Devices:** Hard disk drives (HDD) and Solid State Drives (SSD). 3. **Communication:** Small base stations and networking equipment. 4. **LED Drivers:** Providing stable current for lighting applications. --- ### 5. Land Pattern Example (Reference) While you should always consult the official datasheet for PCB layout, the general footprint for the SD53 series is as follows: ```text Recommended Pad Layout: _______ | | | A: 1.50mm | A | | B: 4.00mm |___| | C: 1.90mm (Gap) | | | |___|___| ``` ---