The **SD18-151-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the SD series of shielded drum core inductors, commonly used in DC-DC converters and power management circuits. --- ## Technical Specifications The following table outlines the primary electrical and physical characteristics of the SD18-151-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 150 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.938 Ω (Typical) | | **RMS Current ($I_{rms}$)** | 0.444 Amps | | **Saturation Current ($I_{sat}$)** | 0.508 Amps | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Shielding** | Ferrite Shielded | --- ## Key Features ### 1. Magnetic Shielding The component is magnetically shielded, which minimizes Electromagnetic Interference (EMI). This is critical for high-density PCB layouts where components are placed close together. ### 2. Compact Form Factor The "18" in the part number refers to the size code (approx. 5.2mm x 5.2mm x 1.8mm). Its low profile makes it ideal for handheld electronics and thin devices. ### 3. Ferrite Core Construction It uses a ferrite drum core that provides high efficiency and high saturation current relative to its physical footprint. --- ## Part Number Breakdown Understanding the nomenclature helps in selecting equivalent parts: * **SD**: Series Name (Shielded Drum) * **18**: Size Code (Dimensions) * **151**: Inductance Code ($15 \times 10^1$ = 150 µH) * **-R**: RoHS Compliant --- ## Common Applications * **Buck/Boost Converters:** Used for energy storage in voltage regulation circuits. * **LED Drivers:** Provides constant current for lighting applications. * **Portable Electronics:** Used in smartphones, tablets, and wearable tech due to its small size. * **Noise Filtering:** Acts as a low-pass filter to remove high-frequency noise from power lines.