The **CTXAL4020F-R36M** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-DC converters and power management modules. --- ## 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics of the component: | Code Segment | Meaning | | :--- | :--- | | **CTXAL** | Series designation (typically shielded metal composite Inductors) | | **4020** | Physical Dimensions: Approx. 4.0mm x 4.0mm x 2.0mm | | **F** | Lead-free / RoHS Compliant | | **R36** | Inductance Value: **0.36 µH** (R represents the decimal point) | | **M** | Tolerance: **±20%** | --- ## 2. Technical Specifications These parts are designed for high-frequency applications where efficiency and space are critical. | Property | Typical Value | | :--- | :--- | | **Inductance** | 0.36 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~5.0 mΩ to 7.0 mΩ (Low resistance for high efficiency) | | **Saturation Current (Isat)** | ~12A to 15A (Current at which inductance drops by ~30%) | | **Heat Rating Current (Irms)** | ~9A to 11A (Current causing 40°C temperature rise) | | **Operating Temperature** | -40°C to +125°C | --- ## 3. Key Electronic Characteristics ### A. Metal Composite Core Unlike traditional ferrite inductors, the "AL" series usually utilizes a **metal powder core**. * **Soft Saturation:** The inductance drops gradually as current increases, rather than a sharp "cliff" drop seen in ferrite. * **High Current Density:** Handles more power relative to its small 4020 footprint. ### B. Magnetic Shielding The construction is molded, meaning the wire is embedded within the magnetic powder. This results in: * **Low EMI:** The magnetic field is contained, reducing interference with nearby components. * **Acoustic Quietness:** Reduced audible "buzzing" or whining under load. ### C. Low DCR (Direct Current Resistance) The "R36" (0.36µH) value is very low, meaning the inductor has very few turns of thick wire. This results in minimal power loss due to heat, making it ideal for high-efficiency voltage regulators. --- ## 4. Typical Applications * **Voltage Regulator Modules (VRM):** Found on motherboards and GPUs. * **DC-DC Converters:** Buck, Boost, and Buck-Boost topologies. * **Battery Powered Devices:** Smartphones, tablets, and wearable tech where space is limited. * **Embedded Systems:** Powering FPGAs and high-speed processors. ---