The **CTML1206F-R047M** is a surface-mount multi-layer ferrite chip inductor. This specific component is designed for use in power circuits, filtering, and high-frequency noise suppression applications. Below is a detailed breakdown of its specifications and electronic characteristics. --- ### 1. Part Number Deciphering Understanding the naming convention helps identify the physical and electrical constraints of the component: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **CTML** | Series | Multi-layer Chip Inductor (Ferrite Core) | | **1206** | Case Size | Imperial size (3.2mm x 1.6mm) | | **F** | Lead-Free | RoHS Compliant / Green material | | **R047** | Inductance Value | **0.047 µH** (47 nH) | | **M** | Tolerance | **±20%** | --- ### 2. Key Electrical Specifications Based on the standard data for the CTML 1206 series, here are the technical parameters for the R047M variant: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.047 µH | | **Tolerance** | ±20% | | **Test Frequency** | 50 MHz | | **DC Resistance (DCR)** | ~0.20 Ω (Max) | | **Rated Current (Idc)** | ~300 mA | | **Self-Resonant Frequency (SRF)** | >320 MHz | | **Operating Temperature** | -55°C to +125°C | --- ### 3. Construction and Material * **Multi-layer Technology:** Unlike wire-wound inductors, this part is created by layering ferrite paste and internal electrode paste. This results in a monolithic, magnetically shielded structure. * **Magnetic Shielding:** The closed magnetic circuit minimizes crosstalk and electromagnetic interference (EMI) with surrounding components. * **Termination:** Usually features nickel barrier plating with a tin (Sn) finish to ensure excellent solderability and prevent "leaching" during the soldering process. --- ### 4. Typical Applications The CTML1206F-R047M is commonly found in the following electronic circuits: 1. **EMI/RFI Suppression:** Filtering high-frequency noise in communication lines. 2. **Power Supply Decoupling:** Used in DC-DC converters to smooth voltage ripples in low-power portable devices (smartphones, tablets). 3. **Signal Processing:** High-speed data lines where a small inductance is needed to maintain signal integrity while filtering noise. --- ### 5. Board Layout Considerations * **Footprint:** Use a standard 1206 (3216 Metric) land pattern. * **Heat:** Ensure that the current passing through the inductor does not exceed the rated **Idc**, as the DCR will cause power dissipation in the form of heat. * **Stray Capacitance:** Because it is a multi-layer part, it has internal parasitic capacitance. Ensure your operating frequency is well below the **SRF** (Self-Resonant Frequency).