The **CTMC1008F-R39J** is a surface-mount (SMD) wire-wound chip inductor. It is commonly used in high-frequency circuits for filtering, impedance matching, and resonance. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical characteristics. | Parameter | Value | Description | | :--- | :--- | :--- | | **Inductance** | 0.39 µH (390 nH) | The nominal inductance value. | | **Tolerance** | ±5% (J) | The allowable deviation from the nominal value. | | **Case Size** | 1008 (2520 Metric) | Dimensions: 2.5mm x 2.0mm. | | **Core Material** | Ferrite | Provides higher inductance in a smaller package. | | **Max DC Current** | ~450 mA | The maximum continuous current it can handle. | | **DC Resistance (DCR)** | ~0.45 Ω (Max) | The internal resistance of the wire. | | **Self-Resonant Freq.** | ~250 MHz | The frequency at which the part stops acting as an inductor. | --- ## 2. Key Features * **Wire-Wound Construction:** Offers significantly higher Q-factors (Quality Factor) and lower DC resistance compared to multilayer inductors. * **Ferrite Core:** Allows for high magnetic flux density, making it efficient for power decoupling and filtering. * **High Reliability:** Designed for surface mount technology (SMT) with excellent solderability and heat resistance. * **Small Footprint:** The 1008 size is ideal for compact consumer electronics. --- ## 3. Common Applications This specific inductor is typically found in: 1. **RF Circuits:** Used for impedance matching in wireless communication modules. 2. **Signal Filtering:** Removing high-frequency noise from data lines. 3. **DC-DC Converters:** Small-scale power management where space is limited. 4. **Mobile Devices:** Used in smartphones, tablets, and wearable tech for signal integrity. --- ## 4. Part Number Breakdown The code **CTMC1008F-R39J** can be decoded as follows: * **CTMC:** Series designation (Molded Chip Inductor). * **1008:** Physical size (0.10 x 0.08 inches). * **F:** Ferrite core material. * **R39:** Inductance value (R denotes the decimal point; 0.39 µH). * **J:** Tolerance code (J = ±5%).