The **SD20-151-R** is a high-power density, low-profile power inductor manufactured by **Eaton (formerly Coiltronics)**. It is part of the SD20 series, designed primarily for surface-mount (SMD) applications where space is limited but performance is critical. ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the SD20-151-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 150 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 0.358 Amps | | **Saturation Current (Isat)** | 0.395 Amps | | **DC Resistance (DCR)** | 1.146 Ohms (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Size / Dimension** | 5.20mm x 5.20mm | | **Height (Seated)** | 2.00mm (Maximum) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **SD:** Series name (Shielded Drum Core). * **20:** Size code (refers to the 2.0mm height profile). * **151:** Inductance code ($15 \times 10^1$ = 150 µH). * **-R:** RoHS compliant designation. --- ### 3. Core Features and Construction * **Magnetic Shielding:** The inductor is magnetically shielded. This minimizes Electromagnetic Interference (EMI), making it safe to use near sensitive components on a PCB. * **Ferrite Core:** Utilizes a ferrite drum core which provides high efficiency and low core losses at high frequencies. * **Compact Footprint:** The 5.2mm square base and 2.0mm height make it ideal for "thin" electronics like smartphones, tablets, and handheld instruments. --- ### 4. Typical Applications The SD20-151-R is commonly found in the following electronic circuits: 1. **DC-DC Converters:** Used as an energy storage element in buck, boost, or SEPIC converters. 2. **LED Drivers:** Provides constant current regulation for backlight displays. 3. **Battery Powered Devices:** Ideal for portable medical devices or IoT sensors due to its small size. 4. **Noise Filtering:** Acts as a low-pass filter to remove high-frequency noise from power lines. ---