The **CTMC1210F-R12K** is a surface-mount (SMD) wire-wound chip inductor. It is commonly used in high-frequency applications for signal filtering, decoupling, and impedance matching. Below is a detailed breakdown of its electronic specifications and characteristics. ### 1. General Specifications The part number follows a specific nomenclature used by manufacturers (typically Central Technologies or similar alternatives). | Feature | Specification | Description | | :--- | :--- | :--- | | **Inductance** | 0.12 µH | The "R12" in the part number denotes 0.12 microhenries. | | **Tolerance** | ±10% | The "K" suffix indicates a 10% tolerance range. | | **Case Size** | 1210 (EIA) | Physical dimensions: 3.2mm x 2.5mm (0.12" x 0.10"). | | **Core Material** | Ferrite / Ceramic | Designed for stable performance across frequency ranges. | | **Mounting Type** | SMD/SMT | Surface Mount Technology for automated PCB assembly. | --- ### 2. Electrical Characteristics These parameters determine how the inductor behaves under load and at specific frequencies. * **Self-Resonant Frequency (SRF):** Usually high (approx. 450 MHz - 500 MHz), making it suitable for RF applications. * **DC Resistance (DCR):** Typically low (around 0.20 - 0.40 Ohms), which minimizes power loss and heat generation. * **Rated Current (I-dc):** Generally rated between 400mA to 550mA, defining the maximum continuous current the part can handle without overheating. * **Quality Factor (Q):** Usually has a minimum Q value around 30 at a test frequency (often 25.2 MHz). --- ### 3. Part Number Breakdown Understanding the code helps in identifying substitutes or similar parts: | Segment | Meaning | | :--- | :--- | | **CTMC** | Series Code (Molded Chip Inductor) | | **1210** | Dimensions (L: 3.2mm, W: 2.5mm) | | **F** | Lead-Free / RoHS Compliant | | **R12** | Inductance Value (R is the decimal: 0.12µH) | | **K** | Tolerance (K = 10%, J = 5%, M = 20%) | --- ### 4. Typical Applications * **Mobile Communication:** Used in cellular phones and wireless modules. * **Filtering:** Employed in LC filters to remove noise from power lines or signal paths. * **Computing:** Found in motherboards and peripherals for EMI suppression. * **RF Circuits:** Impedance matching for antennas and oscillators.