The **CTMC1210-R039K** is a surface-mount (SMD) molded chip inductor typically manufactured by Central Technologies. It is designed for high-frequency applications where stability and compact sizing are required. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.039 µH (39 nH) | | **Tolerance** | ±10% (K) | | **Package Size** | 1210 (3.2mm x 2.5mm) | | **DC Resistance (DCR)** | ~0.15 Ω (Max) | | **Rated Current** | ~450 mA (Typical) | | **Self-Resonant Frequency (SRF)** | 450 MHz (Minimum) | | **Operating Temperature** | -40°C to +125°C | --- ## 2. Part Number Breakdown Understanding the suffix and prefix helps in identifying the exact component requirements: * **CTMC**: Series prefix (Central Technologies Molded Chip Inductor). * **1210**: The physical dimensions (Length 0.12" x Width 0.10"). * **R039**: The inductance value. "R" acts as the decimal point (0.039 µH). * **K**: The tolerance code (K = ±10%, J = ±5%, M = ±20%). --- ## 3. Physical & Material Features * **Molding:** The component is encapsulated in a thermosetting epoxy resin, providing excellent mechanical strength and resistance to moisture and environmental contaminants. * **Core Material:** Usually utilizes a ceramic or ferrite core depending on the specific frequency optimization, though 39nH models typically lean towards ceramic for high SRF. * **Termination:** Features solder-plated terminals (usually Matte Tin over Nickel) compatible with reflow and wave soldering processes. --- ## 4. Common Applications Due to its low inductance and high resonant frequency, the CTMC1210-R039K is used in: 1. **RF Circuits:** Matching networks and high-frequency filters. 2. **Telecommunications:** Signal conditioning in mobile devices and base stations. 3. **Decoupling:** Filtering high-frequency noise in power supply lines for sensitive ICs. 4. **Automotive:** Infotainment and sensor modules (provided they meet AEC-Q200 standards). ---