## Overview: CTML0805F-R39M The **CTML0805F-R39M** is a surface-mount (SMD) multilayer chip inductor. It is designed for high-frequency circuits and general-purpose decoupling in compact electronic devices. --- ### 1. Part Number Breakdown The nomenclature provides specific details about the component's physical and electrical characteristics: | Code Segment | Description | Meaning | | :--- | :--- | :--- | | **CTML** | Series Type | Multilayer Chip Inductor | | **0805** | Case Size | 2.0mm x 1.25mm (Imperial 0805) | | **F** | Material | Ferrite core material (Standard) | | **R39** | Inductance Value | 0.39 µH (R denotes decimal point) | | **M** | Tolerance | ±20% | --- ### 2. Key Specifications These parameters define the operating limits and performance of the inductor: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.39 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.45 Ω (Max) | | **Rated Current (Idc)** | ~150 mA - 200 mA | | **Self-Resonant Frequency (SRF)** | ~150 MHz | | **Operating Temperature** | -55°C to +125°C | --- ### 3. Construction and Features * **Multilayer Technology:** Unlike wire-wound inductors, this is built using layered ceramic/ferrite and internal electrode printing. This results in a monolithic, solid structure. * **Magnetic Shielding:** The multilayer design provides a closed magnetic circuit, which minimizes EMI (Electro-Magnetic Interference) and prevents crosstalk with neighboring components. * **High Reliability:** Excellent solderability and resistance to soldering heat, suitable for reflow or wave soldering. --- ### 4. Common Applications * **Mobile Electronics:** Smartphones, tablets, and wearables where space is limited. * **Power Lines:** Low-current DC power line decoupling to filter out high-frequency noise. * **Signal Lines:** Used in high-speed data interfaces to prevent signal distortion from EMI. * **Audio/Video:** Filtering and noise suppression in consumer electronics. ---