The **CTML1206-R18M** is a Surface Mount Device (SMD) multilayer chip inductor. It is commonly used in high-frequency circuits for signal filtering and impedance matching. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. Technical Specifications The part number follows a standardized naming convention that describes its physical and electrical properties: | Parameter | Value / Description | | :--- | :--- | | **Component Type** | Multilayer Chip Inductor | | **Inductance** | 0.18 µH (180 nH) | | **Tolerance** | ±20% (indicated by the 'M' suffix) | | **Package Size** | 1206 (3.2mm x 1.6mm) | | **Current Rating** | Typically 150mA - 300mA (varies by manufacturer) | | **DC Resistance (DCR)** | Low (approx. 0.30 - 0.50 Ω) | | **Self-Resonant Frequency** | High (> 100 MHz) | --- ### 2. Physical Construction The "CTML" series utilizes a **multilayer construction** rather than a wire-wound core. * **Material:** Built using layers of ceramic (ferrite) material interleaved with screen-printed conductive patterns. * **Termination:** Typically tin-plated (Sn) over nickel (Ni) barrier to prevent leaching during soldering. * **Shielding:** The multilayer structure provides a closed magnetic circuit, resulting in **magnetic shielding** which minimizes electromagnetic interference (EMI) with surrounding components. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying similar parts: | Code Segment | Meaning | | :--- | :--- | | **CTML** | Series: Ceramic/Ferrite Multilayer Inductor | | **1206** | Case Size: 0.12 x 0.06 inches (Metric 3216) | | **R18** | Inductance: "R" acts as a decimal point. R18 = 0.18 µH | | **M** | Tolerance: M = ±20% (K = ±10%, J = ±5%) | --- ### 4. Common Applications Due to its 0.18 µH value and small footprint, this inductor is typically found in: 1. **Noise Suppression:** Filtering high-frequency noise in power supply lines (DC-DC converters). 2. **Signal Conditioning:** Used in RF (Radio Frequency) circuits for decoupling. 3. **Consumer Electronics:** Mobile phones, tablets, and portable medical devices where space is limited.