The **SWF2012CF-2R2M** is a high-frequency wire-wound chip inductor typically used in power management and signal filtering applications. It belongs to the 2012 (0805 inch) size category. --- ### 1. Part Number Breakdown The naming convention follows standard industry identification for surface-mount inductors: | Component Segment | Description | Value/Meaning | |:---|:---|:---| | **SWF** | Series Code | Wire-wound Ferrite Chip Inductor | | **2012** | Dimensions (Metric) | 2.0mm x 1.2mm (0805 in inches) | | **CF** | Material/Feature | Ceramic/Ferrite core variant | | **2R2** | Inductance Value | 2.2 Microhenries ($\mu$H) | | **M** | Tolerance | $\pm$20% | --- ### 2. Technical Specifications While exact parameters can vary slightly by manufacturer (such as Sunlord or Taiyo Yuden), the general characteristics for a 2R2M in this footprint are: * **Inductance:** 2.2 $\mu$H * **DC Resistance (DCR):** Usually ranges between 0.30$\Omega$ to 0.70$\Omega$. * **Rated Current:** Typically between 250mA and 500mA (depends on temperature rise). * **Self-Resonant Frequency (SRF):** High SRF (usually >50 MHz), making it suitable for high-frequency noise suppression. * **Operating Temperature:** Typically -40°C to +125°C. --- ### 3. Construction and Features 1. **Wire-Wound Structure:** Unlike multilayer inductors, these use a copper wire wound around a ferrite core. This results in a higher **Q-factor** (Quality factor) and higher current handling capabilities. 2. **Magnetic Shielding:** Many "CF" variants are resin-coated or shielded to reduce electromagnetic interference (EMI) with surrounding components. 3. **Miniaturization:** The 0805 (2012 metric) size allows for high-density PCB mounting, ideal for portable electronics. --- ### 4. Common Applications * **DC-DC Converters:** Used in the buck/boost stage of small power supplies for smartphones and tablets. * **Signal Line Filtering:** Removing high-frequency noise from data lines. * **RF Circuits:** Matching networks and decoupling in wireless communication modules. * **Consumer Electronics:** Power management in cameras, wearables, and IoT devices. ---