## SWF1608CF-R47M: Technical Specifications and Overview The **SWF1608CF-R47M** is a surface-mount (SMD) wire-wound chip inductor, typically used in high-frequency applications and power management circuits. It belongs to the **1608 (0603 in inches)** size family. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **SWF** | Series | High-frequency wire-wound chip inductor series. | | **1608** | Case Size | Metric dimensions: 1.6mm x 0.8mm (EIA 0603). | | **CF** | Material/Feature | Often denotes specific core material or high-current capability. | | **R47** | Inductance | **0.47 µH** (R represents the decimal point). | | **M** | Tolerance | **±20%** (Standard tolerance for this class). | --- ### 2. Key Technical Specifications While exact values can vary slightly by manufacturer (such as Samwha or Sunlord), the general specifications for this part are as follows: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.15Ω to 0.40Ω (Typical) | | **Rated Current (max)** | ~400mA to 700mA (Depending on temp rise) | | **Self-Resonant Frequency** | >250 MHz | | **Operating Temp** | -40°C to +125°C | --- ### 3. Construction and Material * **Wire-Wound Technology:** Unlike multilayer inductors, this part uses a wire wound around a ceramic or ferrite core. This provides a higher **Q factor** (quality factor) and better current-handling capabilities. * **Encapsulation:** Usually coated with a clear or opaque resin to protect the fine copper wire from mechanical damage and environmental factors. --- ### 4. Common Applications Due to its small footprint and electrical characteristics, the SWF1608CF-R47M is commonly found in: 1. **Mobile Devices:** Power lines for smartphones and tablets. 2. **DC-DC Converters:** Small-scale voltage regulation modules. 3. **RF Circuits:** Used for impedance matching and decoupling in wireless communication modules. 4. **Filtering:** Suppressing high-frequency noise in signal lines. --- ### 5. Design Considerations * **Saturation Current:** Ensure the peak circuit current does not exceed the inductor's saturation point, which would lead to a drop in inductance. * **Thermal Management:** The small 0603 package size means heat dissipation is limited; avoid running it at maximum rated current for extended periods in tight enclosures.