The **SD18-R47-R** is a high-performance, low-profile power inductor manufactured by Eaton (formerly Bussmann). It belongs to the SD series of surface-mount (SMD) shielded drum core inductors. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the SD18-R47-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **Rated Current (Isat)** | 5.31 A (Saturation Current) | | **Rated Current (Irms)** | 3.86 A (Heating Current) | | **DC Resistance (DCR)** | 0.0163 Ω (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Shielded (Magnetic) | | **Package / Case** | 5.20mm x 5.20mm x 1.80mm | --- ### 2. Key Features * **Magnetic Shielding:** The part is ferrite-shielded, which minimizes Electromagnetic Interference (EMI) and prevents the inductor from affecting nearby sensitive components on the PCB. * **Low Profile:** With a maximum height of 1.8mm, it is ideal for thin electronic devices like smartphones, tablets, and wearable tech. * **High Power Density:** Despite its small size, it handles relatively high currents (over 5A saturation) thanks to its core material and construction. * **RoHS Compliant:** The "-R" suffix at the end of the part number indicates compliance with RoHS standards (Lead-free). --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variations: | Segment | Meaning | | :--- | :--- | | **SD** | Series Name (Shielded Drum Core) | | **18** | Size Code (Approx. 5.2 x 5.2 x 1.8 mm) | | **R47** | Inductance Value (R denotes decimal: 0.47 µH) | | **-R** | RoHS Compliant | --- ### 4. Common Applications Due to its high frequency range and low DCR, the SD18-R47-R is commonly found in: 1. **DC-DC Converters:** Used as an energy storage element in buck, boost, or SEPIC converters. 2. **Portable Electronics:** Power management modules for laptops and handheld devices. 3. **Battery Powered Systems:** Where high efficiency and low heat dissipation (low DCR) are critical. ---