The **CTXAL4020F-R56M** is a high-performance, surface-mount (SMD) power inductor. It is part of a category often referred to as "molded power inductors," designed for high-density power applications where space is limited and efficiency is critical. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the component's physical and electrical specifications: | Segment | Meaning | Specification | | :--- | :--- | :--- | | **CTXAL** | Series Prefix | High-current, shielded molded inductor series | | **4020** | Physical Size | Approx. 4.0mm x 4.0mm footprint, 2.0mm height | | **F** | Lead-Free | RoHS compliant / Lead-free termination | | **R56** | Inductance Value | **0.56 µH** (R denotes the decimal point) | | **M** | Tolerance | **±20%** tolerance | --- ### 2. Technical Specifications The electrical characteristics are optimized for DC-DC conversion and voltage regulation modules (VRM). * **Inductance:** 0.56 µH * **DC Resistance (DCR):** Typically very low (mΩ range) to minimize power loss through heat. * **Saturation Current (Isat):** The current level at which inductance drops by a specific percentage (usually 30%). For this size, it typically handles high peak currents. * **Temperature Rise Current (Irms):** The continuous current that causes a 40°C temperature rise above ambient. * **Operating Temperature:** Generally rated from -40°C to +125°C. --- ### 3. Key Features & Construction 1. **Molded Construction:** The coil is embedded in a metal iron powder core. This provides excellent magnetic shielding and reduces "buzz" noise (acoustic noise). 2. **Soft Saturation:** Unlike ferrite inductors that lose inductance sharply, these molded types have a "soft" saturation curve, making them safer under over-current conditions. 3. **Low Profile:** The 2.0mm height makes it ideal for thin electronics like tablets, laptops, and IoT devices. 4. **High Frequency:** Optimized for high-frequency switching power supplies (typically up to several MHz). --- ### 4. Common Applications This part is frequently found in the following circuits: * **DC-DC Converters:** Point-of-load (POL) converters for CPUs and GPUs. * **Mobile Devices:** Smartphones and tablets where board space is premium. * **Battery Powered Systems:** Because of the low DCR, it helps extend battery life by reducing energy waste. * **Automotive Infotainment:** Used in low-voltage power rails for screens and sensors. ---