The **CM322522-R39ML** is a surface-mount (SMD) wire-wound chip inductor commonly used in radio frequency (RF) and signal filtering applications. Below is a breakdown of its technical specifications and physical characteristics. ### 1. Part Number Deciphering The part number follows a standard industry naming convention: | Segment | Meaning | Value | | :--- | :--- | :--- | | **CM** | Series Type | Chip Wire-wound Inductor | | **322522** | Dimensions (EIA) | 3.2mm x 2.5mm x 2.2mm | | **R39** | Inductance Value | 0.39 µH (Microhenries) | | **M** | Tolerance | ±20% | | **L** | Packaging | Tape & Reel (typically) | --- ### 2. Technical Specifications This component is designed for high-frequency stability. Key electrical parameters include: * **Inductance:** 0.39 µH. * **Quality Factor (Q):** Typically around 30 (minimum) at a specific test frequency (usually 25.2 MHz). * **Self-Resonant Frequency (SRF):** Approximately 450 MHz. This is the frequency limit beyond which the part behaves like a capacitor rather than an inductor. * **DC Resistance (DCR):** Max 0.45 Ω. Low DCR is vital to prevent power loss and overheating. * **Rated Current:** Around 450 mA. Exceeding this may cause the core to saturate or the wire to overheat. --- ### 3. Construction and Materials The "Wire-wound" construction provides superior performance compared to multilayer inductors in specific areas: | Feature | Description | | :--- | :--- | | **Core Material** | Ferrite or Alumina Ceramic (Ferrite is standard for R39 values). | | **Termination** | Tin-plated (Pb-Free/RoHS compliant) for easy soldering. | | **Body** | Molded resin or epoxy coating for environmental protection and mechanical strength. | --- ### 4. Common Applications Due to its size and frequency response, the CM322522-R39ML is found in: 1. **RF Circuits:** Impedance matching and resonance in wireless communication modules. 2. **Signal Filtering:** Low-pass or band-pass filters in telecommunications. 3. **Consumer Electronics:** Power decoupling in smartphones, tablets, and GPS units. ---