The **CM453232-R82ML** is a surface-mount (SMD) wire-wound chip inductor commonly used in radio frequency (RF) and signal filtering applications. It is manufactured by companies like Bourns. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the component's physical and electrical specifications: | Segment | Meaning | Specification | | :--- | :--- | :--- | | **CM** | Series | Chip Inductor, Wire-wound | | **453232** | Size (Metric) | 4.5mm x 3.2mm x 3.2mm (1812 in Imperial) | | **R82** | Inductance Value | 0.82 µH | | **M** | Tolerance | ±20% | | **L** | Lead-free | RoHS Compliant | --- ### 2. Key Technical Specifications These parts are designed for stability and high-frequency performance. * **Inductance:** 0.82 microhenries (µH). * **Q-Factor:** Typically high (minimum ~30 at test frequency), indicating low energy loss. * **Self-Resonant Frequency (SRF):** Usually above 200 MHz, defining the maximum usable frequency. * **DC Resistance (DCR):** Low resistance (typically < 0.5 Ohms) to minimize heat and voltage drop. * **Rated Current:** The maximum continuous DC current it can handle (typically 400mA to 500mA for this value). --- ### 3. Construction and Material * **Core Material:** Usually ferrite, which provides high permeability and allows for a compact size. * **Wire-wound Design:** Copper wire is coiled around the core. This construction offers much higher "Q" factors and current handling than multilayer chip inductors. * **Encapsulation:** The coil is protected by a resin or molded plastic body to withstand automated assembly and harsh environments. --- ### 4. Common Applications Due to its 1812 size and inductance characteristics, it is frequently found in: * **RF Circuits:** Impedance matching and resonance. * **Filtering:** Removing high-frequency noise from power lines or signal lines (EMI/RFI suppression). * **Telecommunications:** Base stations, modems, and routers. * **Consumer Electronics:** TV tuners and audio equipment. --- ### 5. Land Pattern (Footprint) For PCB design, use the 1812 (4532 Metric) footprint: ```markdown Dimensions (Approx): L: 4.5 mm W: 3.2 mm H: 3.2 mm ```