The **CM453232-R39KL** is a Surface Mount Device (SMD) wire-wound chip inductor. It is commonly used in high-frequency circuits, telecommunications, and power management modules for filtering and energy storage. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify its physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **CM** | Series | Wire-wound chip inductor series | | **453232** | Case Size | Metric dimensions: 4.5mm x 3.2mm x 3.2mm (EIA 1812) | | **R39** | Inductance Value | **0.39 µH** (R acts as a decimal point) | | **K** | Tolerance | **±10%** | | **L** | Termination | Lead-free / RoHS compliant | --- ### 2. Key Technical Specifications Below are the typical electrical parameters for this specific component: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.39 µH | | **Tolerance** | ±10% | | **Q Factor (Min)** | 30 (at test frequency) | | **Self-Resonant Frequency (SRF)** | ~450 MHz | | **DC Resistance (DCR Max)** | 0.25 Ω | | **Rated Current (Idc Max)** | 540 mA | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Construction and Features * **Core Material:** Typically uses a ferrite or ceramic core depending on the specific frequency requirements, though ferrite is standard for the R39 value to ensure higher inductance stability. * **Encapsulation:** The coil is usually molded or epoxy-coated to provide mechanical strength and environmental protection. * **High Q Factor:** Designed to provide low loss at high frequencies, making it ideal for RF tuning and filtering. * **Size (1812):** The large 4.5mm footprint allows for higher current carrying capacity compared to smaller 0603 or 0805 inductors. --- ### 4. Typical Applications * **EMI Suppression:** Used in power lines to filter out high-frequency noise. * **RF Circuits:** Matching networks for antennas or local oscillators. * **Telecommunications:** Infrastructure equipment like base stations and routers. * **Automotive Electronics:** Used in infotainment systems and ECU power filtering.