The **CM322522-R12ML** is a specific surface-mount (SMD) wire-wound chip inductor. It is commonly used in high-frequency circuits for filtering, decoupling, and impedance matching. ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **CM** | Series | Wire-wound chip inductor series | | **322522** | Dimensions | Metric size: 3.2mm x 2.5mm x 2.2mm (EIA 1210) | | **R12** | Inductance | **0.12 µH** (R denotes the decimal point) | | **M** | Tolerance | **±20%** | | **L** | Termination | Lead-free / RoHS compliant | --- ### 2. Technical Specifications Below are the typical electrical parameters for this specific component: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.12 µH | | **Quality Factor (Q min)** | 30 | | **Test Frequency** | 25.2 MHz | | **Self-Resonant Frequency (SRF)** | 500 MHz (Minimum) | | **DC Resistance (DCR max)** | 0.22 Ω | | **Rated Current (Idc)** | 450 mA | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Key Features and Construction * **Wire-Wound Structure:** Unlike multilayer inductors, these use a copper wire wound around a ferrite or ceramic core, providing higher Q factors and higher current handling capabilities. * **Molded Resin Case:** The "322522" housing is typically a molded thermosetting resin which provides excellent mechanical strength and resistance to humidity. * **Size (EIA 1210):** The 1210 footprint is a standard size, making it compatible with most automated pick-and-place assembly machines. ### 4. Common Applications Due to its high resonant frequency and stable inductance, it is frequently found in: 1. **Telecommunications:** Cell phones, base stations, and GPS modules. 2. **Consumer Electronics:** Video cameras, televisions, and portable audio players. 3. **Power Management:** Small DC-DC converters where space is limited but efficiency is required. --- ### 5. Equivalent/Alternative Parts If this specific part is unavailable, engineers often look for the following series from other manufacturers: * **Bourns:** CM322522 series (Direct) * **TDK:** NLV32 series * **Murata:** LQH32 series ---