The **SD20-1R2-R** is a high-performance, low-profile power inductor typically used in DC-DC converters and power management circuits. It belongs to the SD series manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the SD20-1R2-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 1.2 µH | | **Tolerance** | ±20% | | **DCR (Direct Current Resistance)** | 0.0335 Ω (Max) | | **Irms (Rated Current)** | 2.58 Amps | | **Isat (Saturation Current)** | 3.31 Amps | | **Package / Case** | SMD (5.2mm x 5.2mm x 2.0mm) | | **Shielding** | Shielded (Magnetic) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps in identifying its features: * **SD**: Series name (Shielded Drum Core). * **20**: Size code (Referring to the 2.0mm height). * **1R2**: Inductance value (1.2 microhenries). The 'R' acts as a decimal point. * **-R**: RoHS compliant. --- ### 3. Core Features and Applications #### Features * **Magnetic Shielding:** The part is magnetically shielded to minimize Electromagnetic Interference (EMI), making it ideal for noise-sensitive environments. * **Low Profile:** With a height of only 2.0mm, it is suitable for thin electronic devices like tablets and ultra-books. * **Ferrite Core:** Utilizes a ferrite core for high efficiency and high frequency operation. #### Common Applications 1. **Buck/Boost Converters:** Used as the energy storage element in voltage regulation. 2. **Mobile Electronics:** Smartphones, wearable devices, and digital cameras. 3. **Computer Peripherals:** SSDs, HDDs, and portable storage. 4. **LED Drivers:** Providing stable current for lighting applications. --- ### 4. PCB Footprint Example When designing a PCB for this component, the landing pattern usually follows standard 5020 (Metric) guidelines. ```c // Example Pad Dimensions (Approximate) Pad_Width: 1.5mm Pad_Height: 4.5mm Spacing: 1.7mm (Between pads) Total_Area: 5.2mm x 5.2mm ```