The **CM453232-R68ML** is a wire-wound surface mount (SMD) chip inductor. It belongs to the 1812 case size category and is commonly used for signal filtering, resonance, and noise suppression in electronic circuits. ### 1. Technical Specifications The part number follows a specific nomenclature. Here is the breakdown of the technical parameters: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Inductance** | 0.68 µH | Represented by "R68" | | **Tolerance** | ±20% | Represented by "M" | | **Case Size (Metric)** | 4532 | 4.5mm x 3.2mm | | **Case Size (Imperial)** | 1812 | 0.18" x 0.12" | | **Current Rating (Idc)** | ~450 mA | Maximum current before saturation/overheating | | **DC Resistance (RDC)** | ~0.25 Ω | Resistance of the internal wire | | **SRF** | ~280 MHz | Self-Resonant Frequency | --- ### 2. Part Number Breakdown Understanding the code helps in identifying substitutes or similar components: 1. **CM**: Series prefix (typically Wire-wound Chip Inductor). 2. **453232**: Dimensions (Length 4.5mm, Width 3.2mm, Height 3.2mm). 3. **R68**: Inductance value. The "R" acts as a decimal point ($0.68$ microhenries). 4. **M**: Tolerance code ($M = \pm 20\%$, $K = \pm 10\%$, $J = \pm 5\%$). 5. **L**: Usually indicates Lead-free/RoHS compliance or specific packaging. --- ### 3. Key Construction & Features * **Wire-Wound Core:** Consists of a copper wire wound around a ferrite or ceramic core. This provides higher Q-factors and higher current handling compared to multilayer inductors. * **Encapsulation:** The "32" height indicates a molded or resin-coated body that protects the winding from mechanical stress and environmental moisture. * **High Reliability:** Designed for automated surface mount assembly (Pick-and-Place). --- ### 4. Typical Applications The CM453232-R68ML is versatile and found in: * **Power Supplies:** Used in DC-DC converters for small-scale voltage regulation. * **Filtering:** Low-pass filters to remove high-frequency noise in communication lines. * **Telecommunications:** Modems, routers, and base station equipment. * **Consumer Electronics:** TV tuners, video equipment, and camcorders.