The **AMELA4012S-R47M** is a high-performance power inductor, typically categorized as a surface-mount device (SMD) used for energy storage and noise filtering in power management circuits. ### 1. Part Number Breakdown Understanding the nomenclature helps identify its physical and electrical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **AMELA** | Series Prefix | High-current, shielded power inductor series | | **4012** | Case Size | ~4.0mm x 4.0mm footprint, 1.2mm height | | **S** | Construction | Shielded type (reduces EMI) | | **R47** | Inductance Value | 0.47 µH | | **M** | Tolerance | ±20% | --- ### 2. Key Technical Specifications Based on standard industry parameters for this specific footprint and value: * **Inductance:** 0.47 µH * **DC Resistance (DCR):** Low resistance (typically in the milliohm range) to minimize power loss. * **Saturation Current ($I_{sat}$):** The current level at which inductance drops by a specific percentage (usually 30%). For this size, it is usually quite high (approx. 5A–7A). * **Heating Current ($I_{rms}$):** The continuous current that causes a specific temperature rise (usually 40°C). * **Operating Temperature:** Typically rated for $-40°C$ to $+125°C$. --- ### 3. Structural Features The AMELA series is designed with modern power requirements in mind: * **Magnetic Shielding:** The core is encapsulated or closed, which prevents magnetic flux from interfering with neighboring components on the PCB. * **Low Profile:** The "12" in the name denotes a maximum height of roughly 1.2mm, making it ideal for slim electronics like smartphones or tablets. * **Metal Alloy/Ferrite Core:** Usually utilizes a composite core material to handle high peak currents without sudden saturation. --- ### 4. Common Applications Due to its low inductance and high current handling, it is primarily used in: 1. **DC-DC Converters:** Buck or Boost converters in mobile devices. 2. **Voltage Regulator Modules (VRM):** Used in CPUs and GPUs for stable power delivery. 3. **LED Drivers:** Providing consistent current to high-brightness LEDs. 4. **Embedded Systems:** Industrial or automotive sensors where space is constrained. ---