The **HMLQ20121T-R47MXR** is a high-performance surface-mount (SMD) power inductor, typically utilized in power management circuits where space is limited and efficiency is critical. It belongs to the **Molded Power Inductor** category. --- ## 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **HMLQ** | Series Name | High-current, low-profile molded inductor | | **2012** | Case Size (Metric) | 2.0mm x 1.25mm (approx. 0805 Imperial) | | **1T** | Height/Packaging | 1.0mm thickness, Tape & Reel | | **R47** | Inductance Value | 0.47 µH | | **M** | Tolerance | ±20% | | **XR** | Material/Internal Code | Standard automotive/industrial grade material | --- ## 2. Key Technical Specifications While exact values can vary slightly by manufacturer (e.g., Cyntec, Delta, or Sunlord), these are the typical parameters for this specific part: ### Electrical Properties * **Inductance:** 0.47 µH * **Tolerance:** ±20% * **DC Resistance (DCR):** ~20mΩ to 35mΩ (Max) * **Saturation Current ($I_{sat}$):** Typically between 4.0A and 5.5A (depending on the 30% inductance drop). * **Heating Current ($I_{rms}$):** Typically between 3.5A and 4.5A (based on a 40°C temperature rise). ### Physical Properties * **Construction:** Metal alloy powder molding. This design provides better saturation characteristics and lower acoustic noise compared to traditional ferrite drum cores. * **Operating Temperature:** Generally -55°C to +125°C. --- ## 3. Core Technologies & Advantages ### A. Molded Construction Unlike wire-wound inductors with an open core, the HMLQ series uses a **metal powder** that is molded directly around the coil. This offers: * **Soft Saturation:** The inductance drops gradually as current increases, rather than a sharp crash. * **Magnetic Shielding:** Naturally shielded to reduce Electromagnetic Interference (EMI) with surrounding components. ### B. Low Profile With a height of only **1.0mm**, this part is ideal for ultra-thin devices like smartphones, tablets, and wearables. --- ## 4. Typical Applications The R47 (0.47 µH) value is commonly used in high-frequency DC-DC converters: 1. **Buck Converters:** Used in voltage regulator modules (VRM) for CPUs and GPUs. 2. **Smartphones:** Power rails for PMIC (Power Management IC) applications. 3. **SSD/Storage:** Power filtering for high-speed data drives. 4. **IoT Devices:** Compact power modules requiring high efficiency in a small footprint. ---